FIELD GUIDESource-led reference
Port & Cable

P190 / PC power / Connector

8-pin +12 V CPU power connector (EPS12V form)

The documented +12 V processor-power interface includes an 8-pin / 2x4 connector form used for CPU power.

Also called EPS12V CPU 8 pin 4+4 CPU power 2x4 CPU power

CPU power and PCIe auxiliary power are separate cable roles, even when both have eight positions.

Look for

Read the motherboard CPU-power label and PSU cable designation; do not substitute a PCIe cable because the shell looks similar.

Claim inspection dates: 2026-10-05, 2026-10-11, 2026-10-12, 2026-10-22 · Independent review pending

8-pin +12 V CPU power connector (EPS12V form): three-quarter view. Computer-generated illustration, not a photograph.

Three-quarter view Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

8-pin +12 V CPU power connector (EPS12V form): mating face. Computer-generated illustration, not a photograph.

Mating face Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

8-pin +12 V CPU power connector (EPS12V form): fitted in place. Computer-generated illustration, not a photograph.

Fitted in place Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

8-pin +12 V CPU power connector (EPS12V form): original recognition drawing, not to scale.

Recognition drawing Original schematic, not to scale. Drawing review pending.

Image inspection / P190

See the view. Check its scope.

2 registered views for this reference. Different part examples are not automatically mates; all remain not to scale and independently unapproved.

Power roles / equipment end and PSU end. Concept only; not a connector drawing, pinout or fit approval. (private workspace)

P190 / Concept — not physical geometry

Power roles / equipment end and PSU end

CPU, PCIe and PSU-side roles are separate requirements; no physical geometry.

Conceptual source-field relationship; not a physical view · Concept only

Not to scale. Technical and rights review pending.

Inspect view & provenance (private workspace)
EPS12V / CPU: Two equally sized labelled groups: 4 + 4. Concept diagram only; no physical connector geometry is depicted. (private workspace)

P190 / Concept — not physical geometry

EPS12V / CPU

CORSAIR CPU cable example

4+4 groups, not a mating face · Concept only

Not to scale. Technical and rights review pending.

Inspect view & provenance (private workspace)

Matching notes / PC power / P190

Is the CPU end enough to identify the whole cable?

FIELD NOTES 03

No. The component-end CPU role and the modular PSU-end cable type are separate decisions. The familiar 4+4 split does not settle PSU compatibility.

SOURCE-SUPPORTED LEAD

What the evidence supports

Use the EPS designation at the component end and the exact PSU’s documented cable type at the other end.

EXPLICIT SOURCE EXCLUSION

What not to conclude

CORSAIR explicitly excludes Type 3/4 cables from Type 5 supplies.

NOT ESTABLISHED

Keep this check open

Cavity keys, an unknown cable’s wiring and cross-brand substitution remain unverified.

Before you choose a part

  1. Record the exact PSU model and its compatible cable type.
  2. Read the motherboard’s processor-power designation.
  3. Stop if the cable identity or either end is uncertain.
Evidence for this decision · 3 source-scoped observations

C190A (private workspace) — Intel documents an 8-pin / 2x4 +12 V processor-power connector form in the cited ATX design guide.

V36 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction or end-to-end compatibility proof. S198

C190C (private workspace) — CORSAIR illustrates the CPU-power cable role with an EPS12V 4+4 arrangement; the split is an example, not a requirement for every EPS cable.

Cable-division concept only; exact face geometry was not inspected. S474

C190D (private workspace) — CORSAIR warns that Type 3 and Type 4 modular PSU cables are not compatible with Type 5 power supplies.

This separate PSU-end check is not resolved by identifying an EPS12V component-end connector. S489

Manufacturer evidence is not an independent review, wiring assignment or hardware test.

Visual atlas / Series 02 / P190

Keep the unknown visible.

PHYSICAL VIEW BLOCKED
EPS12V / CPU: Two equally sized labelled groups: 4 + 4. Concept diagram only; no physical connector geometry is depicted.
Cable division concept. CORSAIR CPU cable example. 4+4 groups, not a mating face. Independently fitted; not a size reference.

What this view supports

  1. Two equally sized labelled groups: 4 + 4
  2. The concept describes the component end, never the modular PSU socket

What remains unknown

This is not a drawing of cavity keys, pins, latches or a universal EPS cable.

Why no physical view? Linked CORSAIR product image unavailable; Intel text/table does not establish the desired external view.

The next useful check

Read the cable label, exact PSU cable compatibility and the board connector designation before any connection.

CPU power is not PCIe power
1 added source-scoped observations

C190C CORSAIR illustrates the CPU-power cable role with an EPS12V 4+4 arrangement; the split is an example, not a requirement for every EPS cable.

Cable-division concept only; exact face geometry was not inspected. Source checked 2026-10-11; independent review pending. S474 · Evidence trail → (private workspace)

Exact source view, limits and rights

Visual inspection 2026-10-11. AI-assisted source inspection; independent drawing and rights reviews pending. These are original qualitative interpretations, not mechanical drawings, pinouts or approved connections.

Independent simplified vector interpretation and original factual paraphrase only. No manufacturer image, PDF, CAD, logo or traced path is redistributed. Independent technical and rights assessment remains pending.

  • S474 · CORSAIR — Which PSU cables go where? — EPS and PCIe sections

    4-pin ATX12V / 8-pin EPS12V and 6-pin / 6+2-pin PCIe sections. Text inspected; linked product images could not be retrieved.

    Split-cable examples and CPU/PCIe role distinction only. No physical mating-face art is authorized by this text inspection. Only the exact named source/example supports the observation. No universal mating, wiring, maximum rating or mechanical tolerance is inferred. Not identified; retrieval is not a revision date.

  • S198 · Intel — ATX Version 3.0 — +12 V Power Connector

    +12 V CPU power connector section

    Documents 4-pin and 8-pin +12 V processor power connector forms; V36 uses only the 8-pin form for identification. Identification/reference scope only. V36 does not convert this source into a universal pinout, fabrication drawing, electrical approval or end-to-end compatibility verdict.

Canonical evidence is retained separately. Existing claim dates are unchanged; only new V118 claims have a new inspection date. No live electrical, energized probing, forced mating or optical-port inspection is recommended.

INTERNAL SYSTEMS / POWER

An EPS CPU 8-pin is not the GPU PCIe 8-pin

The Intel ATX guide separately defines processor +12 V 2×4 power and PCIe add-in-card auxiliary power. Similar position counts do not establish the same keying, wiring, destination or protection. CPU/EPS 4+4 and GPU/PCIe 6+2 should be identified by original cable labeling and exact motherboard/PSU manuals.

Conceptual role comparison: CPU / EPS +12 V versus GPU / PCIe auxiliary. Similar number of positions ≠ identical keys, wiring, modular PSU ends. Not to scale, no pinout or mechanical mating dimensions.
Two eight-pin power destinations. Original qualitative role diagram; not mechanical artwork, not to scale or a wiring map. Source context S198 · S199.

Three checks before proceeding

  1. Locate CPU_PWR / EPS designation and the motherboard’s installation instructions.
  2. Confirm original harness marking and PSU model for the CPU feed.
  3. Stop if the keys, housing or cable route do not match the maker instructions.

One mistake to avoid

Forcing an eight-position GPU lead into a CPU header or using an adapter to defeat a key.

Full technical reading, sources and related identities →

Claim-specific evidence remains in the canonical record. Concept diagrams do not show any safe wiring or mechanical mating geometry.

The useful distinction

Recognize it. Then verify it.

The documented +12 V processor-power interface includes an 8-pin / 2x4 connector form used for CPU power. [C190A]

CORSAIR illustrates the CPU-power cable role with an EPS12V 4+4 arrangement; the split is an example, not a requirement for every EPS cable. [C190C]

CORSAIR warns that Type 3 and Type 4 modular PSU cables are not compatible with Type 5 power supplies. [C190D]

CORSAIR describes more than one processor-power input arrangement and directs the reader to the motherboard manual to determine whether both eight-position CPU inputs are required. [C190E]

SSI names Molex 39-01-2080 for its eight-position 2 × 4 processor/memory power connector. The exact Molex housing specification lists two rows and 4.20 mm mating-interface pitch. [C190W]

PC internals · a documented check

Both power plugs have eight positions. Which one belongs here?

Use the connector designation and approved cable—not the count or location alone. CORSAIR distinguishes CPU/EPS 4+4 and PCIe 6+2 examples, and notes that some motherboards also have PCIe-power inputs. C190C · C192C · C192F

What the documentation establishes—and what still needs checking
CheckDocumented distinctionBoundary
CPU / EPS exampleCORSAIR illustrates CPU power with an EPS12V 4+4 cable end. C190CThe split is an example, not a requirement for every CPU cable.
PCIe exampleCORSAIR distinguishes the 6+2 PCIe end from EPS12V. C192C · C192FBeing mounted on a motherboard does not prove a socket is EPS.
Required inputsProcessor-power input arrangements vary. C190ERead the exact motherboard manual before deciding whether a second input is required.
Modular PSU endCORSAIR excludes Type 3/4 cables from Type 5 power supplies. C190D · C192DA matching load-end shape does not approve the other end of a cable.

Check these next

  1. Read the socket designation in the motherboard or graphics-card manual.
  2. Match the cable’s documented role and type to the exact PSU model.
  3. Stop when the cable provenance, designation or housing does not match; do not defeat keys or improvise wiring.

Keep this limit: Incorrect modular PSU cable types can damage hardware. This comparison is not a pinout or interchangeability authorization. C192D

Identify the documented form

Identify processor power by the board/manual and PSU cable designation.

  1. The cited EPS12V cable example uses a split arrangement distinct from the documented PCIe example; a split is not universal to every EPS cable. S474 · S474
  2. The motherboard manual determines the required processor-power inputs; the presence of more than one input is not itself an instruction to leave one unused. S560
Documented identity facts; exact part and variant scope remains with each value
Nominal contacts8S198Documented position count only; V36 does not publish the electrical assignment.
Positions / cavity span8 (Claim C190E)S560Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. The documented configurations are examples; connector count alone does not determine an unknown motherboard’s requirements.
Populated contactsNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Connector roleplug; headerS198 · S215Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. processor-power cable plug / motherboard header interface
Rows, pitch, dimensions, keying and view limits
Additional scoped facts; not a fabrication drawing or a mating approval
Contact rows2 (Source-described array; C190A); 2 (Molex39-01-2080)S198 · S977 · S760Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. V36 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction or end-to-end compatibility proof. Exact Molex39-01-2080 receptacle housing named in SSI PSDG2008v1.2.1 section4.2.2, component geometry only. Quantity context: Manufacturer Number of Rows / SSI2x4 array.
Contact pitch4.2 mm Manufacturer Pitch Mating Interface (Molex39-01-2080)S977 · S760Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. Exact Molex39-01-2080 receptacle housing named in SSI PSDG2008v1.2.1 section4.2.2, component geometry only.
Dimensions / axisNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Coupling / latchNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Keying / polarizationsquare and chamfered cavities shown with latch above; exact pattern belongs to this board drawing, not a universal EPS/PCIe interchange rule (MSI B550-A PRO CPU_PWR1)S757Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example MSI B550-A PRO CPU_PWR1: Device-specific eight-position CPU power header. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. MSI is board vendor; connector OEM/series/pitch remain unknown. Do not import unrelated Molex8-position housing as an EPS equivalent.
View conventionMSI p.34 header drawing, latch above: 8 upper-left / 5 upper-right and 4 lower-left / 1 lower-right; not cable rear view (MSI B550-A PRO CPU_PWR1)S757Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example MSI B550-A PRO CPU_PWR1: Device-specific eight-position CPU power header. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. MSI is board vendor; connector OEM/series/pitch remain unknown. Do not import unrelated Molex8-position housing as an EPS equivalent.
Contact gender / arrangementNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
MountingNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Shell / formNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
ManufacturerNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
SeriesNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Exact part / implementationMSI B550-A PRO CPU_PWR1 (MSI B550-A PRO CPU_PWR1)S757Separate exact examples; retain each value’s source, role, axis and part scope. Exact named example MSI B550-A PRO CPU_PWR1: Device-specific eight-position CPU power header. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. MSI is board vendor; connector OEM/series/pitch remain unknown. Do not import unrelated Molex8-position housing as an EPS equivalent.
Recorded markingsNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Keep this limit: CORSAIR’s stated modular cable-type incompatibility must not be generalized into a universal PSU-side pinout. S489

Make the next check

Match exact PSU model/cable type and motherboard CPU-power requirements before any connection.

Existing source inspection and AI review remain distinct from independent technical review. A matching form does not establish a safe connection.

Recorded variant and source limits
  • The normalized grid is not a physical face-view pin locator.
  • Do not equate CPU/EPS-style plugs with superficially similar PCIe auxiliary-power plugs.
  • Modular PSU-side pinouts are outside this profile.
  • Intel ATX v3 +12 V Power 8-pin connector: Contact numbers per Table 5-9.
  • SSI 2008 PSDG processor 0 / memory 2x4 connector (Molex 39-01-2080): Contact numbers per Table 4.
  • SSI 2008 PSDG processor 1 / memory 2x4 connector (Molex 39-01-2080): Contact numbers per Table 5.
  • MSI MAG B550 TOMAHAWK CPU_PWR1 board header: Board header numbering per manual diagram.
  • GIGABYTE B550 AORUS ELITE (AX) ATX_12V board header: Board header numbering per manual diagram.
  • Intel rev 2.1a eight-pin CPU power: Numbered assignments only. The retrieved Intel section supplies a table but no numbered mating-face or wire-side drawing; spatial orientation is UNVERIFIED. Do not mirror these numbers onto an unidentified cable end.
  • MSI B550-A PRO CPU_PWR1: MSI p.34 drawing, latch at top: upper endpoints 8 left, 5 right; lower endpoints 4 left, 1 right. Board view, not cable rear.
Report a correction to this identification or view →

Bounded facts, visible unknowns

Specifications and limits

8-pin +12 V CPU power connector (EPS12V form) facts and limitations
Documented identification8-position 2x4 +12 V processor-power form. [C190A]
Mechanical dimensionsNo independently reviewed mechanical drawing in V36; do not use this page for fabrication, fit testing or tolerance work.
Engineering pinoutSource-checked engineering profile available; independent review pending. Open engineering profile →
Verified device listNot included. Check exact device and accessory documentation.
A boundary, not an omission to guess around.

Use the source-backed form or position count only for identification. Resolve ratings, protocol, direction, wiring, cable construction and exact device support from the relevant equipment and component documentation.

Before you connect

What to check

  1. Identify the exact connector family and variant from the equipment or cable documentation.
  2. Keep shape, contact count, protocol, electrical rating and device support as separate facts.
  3. Do not force, rewire or adapt a connector from this recognition record; resolve the remaining requirements first.
Trace a supported connection class →

Pins & wiring

Pinout

Choose the exact wiring. Pin numbers follow its stated view; a schematic does not establish physical positions. Check your exact device before wiring.

What the status labels mean
Confirmed
Recorded research passes agree within this variant; this is not independent human review or hardware validation.
Single source
Only one underlying document, or one pass, supports this assignment.
Device-specific
Supported for the named equipment or wiring only. Check your device’s manual.
Unverified
Missing or conflicting evidence. Do not wire from this row.
Not connected
The source explicitly says NC, no contact or no pin for this wiring.
Wiring variant

Intel ATX v3 +12 V Power 8-pin connector

View and evidence limits

Contact numbers per Table 5-9.

  • P190 EPS12V 8-pin — **Agree**: 1-4 return, 5-8 +12 V — Same Intel revision in both passes; different MSI board manuals, plus SSI and GIGABYTE in A. SSI's processor-specific rail names remain separate. Neither pass obtained the normative EPS12V guide itself.
  • The SSI EPS12V Power Supply Design Guide (e.g. v2.91/v2.92) was not found on an official SSI/SNIA host; only a third-party mirror was located and it was not used. The EPS12V document's own table is therefore not cited; the same 2x4 contact functions are verified from Intel ATX v3 and the SSI 2008 PSDG.
8-pin +12 V CPU-power logical assignmentContact numbers per Table 5-9.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: COM (confirmed)12: COM (confirmed)23: COM (confirmed)34: COM (confirmed)45: +12V2 DC (confirmed)56: +12V2 DC (confirmed)67: +12V2 DC (confirmed)78: +12V2 DC (confirmed)8powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Intel ATX v3 +12 V Power 8-pin connector — source-scoped contact map
PinSignalWhat it doesStatus
1COMGround reference and return.Confirmed
Sources
2COMGround reference and return.Confirmed
Sources
3COMGround reference and return.Confirmed
Sources
4COMGround reference and return.Confirmed
Sources
5+12V2 DCPower connection (+12V2 DC). Check the specified supply.Confirmed
Sources
6+12V2 DCPower connection (+12V2 DC). Check the specified supply.Confirmed
Sources
7+12V2 DCPower connection (+12V2 DC). Check the specified supply.Confirmed
Sources
8+12V2 DCPower connection (+12V2 DC). Check the specified supply.Confirmed
Sources
Sources (3)

SSI 2008 PSDG processor 0 / memory 2x4 connector (Molex 39-01-2080)

View and evidence limits

Contact numbers per Table 4.

  • P190 EPS12V 8-pin — **Agree**: 1-4 return, 5-8 +12 V — Same Intel revision in both passes; different MSI board manuals, plus SSI and GIGABYTE in A. SSI's processor-specific rail names remain separate. Neither pass obtained the normative EPS12V guide itself.
  • The SSI EPS12V Power Supply Design Guide (e.g. v2.91/v2.92) was not found on an official SSI/SNIA host; only a third-party mirror was located and it was not used. The EPS12V document's own table is therefore not cited; the same 2x4 contact functions are verified from Intel ATX v3 and the SSI 2008 PSDG.
8-pin +12 V CPU-power logical assignmentContact numbers per Table 4.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: COM (confirmed)12: COM (confirmed)23: COM (confirmed)34: COM (confirmed)45: +12 V1 (single_source)56: +12 V1 (single_source)67: +12 V3a (single_source)78: +12 V3a (single_source)8powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
SSI 2008 PSDG processor 0 / memory 2x4 connector (Molex 39-01-2080) — source-scoped contact map
PinSignalWhat it doesStatus
1COMGround reference and return.Confirmed
Sources
2COMGround reference and return.Confirmed
Sources
3COMGround reference and return.Confirmed
Sources
4COMGround reference and return.Confirmed
Sources
5+12 V1Power connection (+12 V1). Check the specified supply.Single source
Sources
6+12 V1Power connection (+12 V1). Check the specified supply.Single source
Sources
7+12 V3aPower connection (+12 V3a). Check the specified supply.Single source
Sources
8+12 V3aPower connection (+12 V3a). Check the specified supply.Single source
Sources
Sources (3)

SSI 2008 PSDG processor 1 / memory 2x4 connector (Molex 39-01-2080)

View and evidence limits

Contact numbers per Table 5.

  • P190 EPS12V 8-pin — **Agree**: 1-4 return, 5-8 +12 V — Same Intel revision in both passes; different MSI board manuals, plus SSI and GIGABYTE in A. SSI's processor-specific rail names remain separate. Neither pass obtained the normative EPS12V guide itself.
  • The SSI EPS12V Power Supply Design Guide (e.g. v2.91/v2.92) was not found on an official SSI/SNIA host; only a third-party mirror was located and it was not used. The EPS12V document's own table is therefore not cited; the same 2x4 contact functions are verified from Intel ATX v3 and the SSI 2008 PSDG.
8-pin +12 V CPU-power logical assignmentContact numbers per Table 5.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: COM (confirmed)12: COM (confirmed)23: COM (confirmed)34: COM (confirmed)45: +12 V2 (confirmed)56: +12 V2 (confirmed)67: +12 V3b (single_source)78: +12 V3b (single_source)8powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
SSI 2008 PSDG processor 1 / memory 2x4 connector (Molex 39-01-2080) — source-scoped contact map
PinSignalWhat it doesStatus
1COMGround reference and return.Confirmed
Sources
2COMGround reference and return.Confirmed
Sources
3COMGround reference and return.Confirmed
Sources
4COMGround reference and return.Confirmed
Sources
5+12 V2Power connection (+12 V2). Check the specified supply.Confirmed
Sources
6+12 V2Power connection (+12 V2). Check the specified supply.Confirmed
Sources
7+12 V3bPower connection (+12 V3b). Check the specified supply.Single source
Sources
8+12 V3bPower connection (+12 V3b). Check the specified supply.Single source
Sources
Sources (3)

MSI MAG B550 TOMAHAWK CPU_PWR1 board header

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

Board header numbering per manual diagram.

  • P190 EPS12V 8-pin — **Agree**: 1-4 return, 5-8 +12 V — Same Intel revision in both passes; different MSI board manuals, plus SSI and GIGABYTE in A. SSI's processor-specific rail names remain separate. Neither pass obtained the normative EPS12V guide itself.
  • The SSI EPS12V Power Supply Design Guide (e.g. v2.91/v2.92) was not found on an official SSI/SNIA host; only a third-party mirror was located and it was not used. The EPS12V document's own table is therefore not cited; the same 2x4 contact functions are verified from Intel ATX v3 and the SSI 2008 PSDG.
8-pin +12 V CPU-power logical assignmentBoard header numbering per manual diagram.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: Ground (device_specific)12: Ground (device_specific)23: Ground (device_specific)34: Ground (device_specific)45: +12V (device_specific)56: +12V (device_specific)67: +12V (device_specific)78: +12V (device_specific)8powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
MSI MAG B550 TOMAHAWK CPU_PWR1 board header — source-scoped contact map
PinSignalWhat it doesStatus
1GroundGround reference and return.Device-specific
Sources
2GroundGround reference and return.Device-specific
Sources
3GroundGround reference and return.Device-specific
Sources
4GroundGround reference and return.Device-specific
Sources
5+12VPower connection (+12V). Check the specified supply.Device-specific
Sources
6+12VPower connection (+12V). Check the specified supply.Device-specific
Sources
7+12VPower connection (+12V). Check the specified supply.Device-specific
Sources
8+12VPower connection (+12V). Check the specified supply.Device-specific
Sources
Sources (1)

GIGABYTE B550 AORUS ELITE (AX) ATX_12V board header

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

Board header numbering per manual diagram.

  • P190 EPS12V 8-pin — **Agree**: 1-4 return, 5-8 +12 V — Same Intel revision in both passes; different MSI board manuals, plus SSI and GIGABYTE in A. SSI's processor-specific rail names remain separate. Neither pass obtained the normative EPS12V guide itself.
  • The SSI EPS12V Power Supply Design Guide (e.g. v2.91/v2.92) was not found on an official SSI/SNIA host; only a third-party mirror was located and it was not used. The EPS12V document's own table is therefore not cited; the same 2x4 contact functions are verified from Intel ATX v3 and the SSI 2008 PSDG.
8-pin +12 V CPU-power logical assignmentBoard header numbering per manual diagram.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: GND (Only for 2x4-pin 12V) (device_specific)12: GND (Only for 2x4-pin 12V) (device_specific)23: GND (device_specific)34: GND (device_specific)45: +12V (Only for 2x4-pin 12V) (device_specific)56: +12V (Only for 2x4-pin 12V) (device_specific)67: +12V (device_specific)78: +12V (device_specific)8powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
GIGABYTE B550 AORUS ELITE (AX) ATX_12V board header — source-scoped contact map
PinSignalWhat it doesStatus
1GND (Only for 2x4-pin 12V)Ground reference and return.Device-specific
Sources
2GND (Only for 2x4-pin 12V)Ground reference and return.Device-specific
Sources
3GNDGround reference and return.Device-specific
Sources
4GNDGround reference and return.Device-specific
Sources
5+12V (Only for 2x4-pin 12V)Power connection (+12V (Only for 2x4-pin 12V)). Check the specified supply.Device-specific
Sources
6+12V (Only for 2x4-pin 12V)Power connection (+12V (Only for 2x4-pin 12V)). Check the specified supply.Device-specific
Sources
7+12VPower connection (+12V). Check the specified supply.Device-specific
Sources
8+12VPower connection (+12V). Check the specified supply.Device-specific
Sources
Sources (1)

Intel rev 2.1a eight-pin CPU power

View and evidence limits

Numbered assignments only. The retrieved Intel section supplies a table but no numbered mating-face or wire-side drawing; spatial orientation is UNVERIFIED. Do not mirror these numbers onto an unidentified cable end.

  • P190 EPS12V 8-pin — **Agree**: 1-4 return, 5-8 +12 V — Same Intel revision in both passes; different MSI board manuals, plus SSI and GIGABYTE in A. SSI's processor-specific rail names remain separate. Neither pass obtained the normative EPS12V guide itself.
  • SSI EPS12V full text was not obtained. Verified scope is the named Intel table and MSI implementation; proprietary PSU-end wiring is unverified.
8-pin +12 V CPU-power logical assignmentNumbered assignments only. The retrieved Intel section supplies a table but no numbered mating-face or wire-side drawing; spatial orientation is UNVERIFIED. Do not mirror these numbers onto an unidentified cable end.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: COM (confirmed)12: COM (confirmed)23: COM (confirmed)34: COM (confirmed)45: +12V2 DC (confirmed)56: +12V2 DC (confirmed)67: +12V2 DC (confirmed)78: +12V2 DC (confirmed)8powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Intel rev 2.1a eight-pin CPU power — source-scoped contact map
PinSignalWhat it doesStatus
1COMGround reference and return.Confirmed
Sources
2COMGround reference and return.Confirmed
Sources
3COMGround reference and return.Confirmed
Sources
4COMGround reference and return.Confirmed
Sources
5+12V2 DCPower connection (+12V2 DC). Check the specified supply.Confirmed
Sources
6+12V2 DCPower connection (+12V2 DC). Check the specified supply.Confirmed
Sources
7+12V2 DCPower connection (+12V2 DC). Check the specified supply.Confirmed
Sources
8+12V2 DCPower connection (+12V2 DC). Check the specified supply.Confirmed
Sources
Sources (5)

MSI B550-A PRO CPU_PWR1

Device-specific wiring. Check your device’s manual before connecting or applying power.

View and evidence limits

MSI p.34 drawing, latch at top: upper endpoints 8 left, 5 right; lower endpoints 4 left, 1 right. Board view, not cable rear.

  • P190 EPS12V 8-pin — **Agree**: 1-4 return, 5-8 +12 V — Same Intel revision in both passes; different MSI board manuals, plus SSI and GIGABYTE in A. SSI's processor-specific rail names remain separate. Neither pass obtained the normative EPS12V guide itself.
  • SSI EPS12V full text was not obtained. Verified scope is the named Intel table and MSI implementation; proprietary PSU-end wiring is unverified.
8-pin +12 V CPU-power logical assignmentMSI p.34 drawing, latch at top: upper endpoints 8 left, 5 right; lower endpoints 4 left, 1 right. Board view, not cable rear.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: Ground (device_specific)12: Ground (device_specific)23: Ground (device_specific)34: Ground (device_specific)45: +12V (device_specific)56: +12V (device_specific)67: +12V (device_specific)78: +12V (device_specific)8powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
MSI B550-A PRO CPU_PWR1 — source-scoped contact map
PinSignalWhat it doesStatus
1GroundGround reference and return.Device-specific
Sources
2GroundGround reference and return.Device-specific
Sources
3GroundGround reference and return.Device-specific
Sources
4GroundGround reference and return.Device-specific
Sources
5+12VPower connection (+12V). Check the specified supply.Device-specific
Sources
6+12VPower connection (+12V). Check the specified supply.Device-specific
Sources
7+12VPower connection (+12V). Check the specified supply.Device-specific
Sources
8+12VPower connection (+12V). Check the specified supply.Device-specific
Sources
Sources (1)

What is not established

This field note does not approve a connection, adapter, cable assembly, rewiring scheme or fabricated part. It intentionally omits unsupported pin assignments and mechanical tolerances.

Your next step

Move from the form to the requirement.

Read the engineering reference Source-scoped details, orientation and explicit unknowns.Work through a connection Choose your task before deciding on a cable.Explore this evidence trail Inspect the claims and their dependencies. (private workspace)

The source trail

Evidence for this page

AI-assisted inspection is not independent engineering review. Source scope and access limitations are disclosed below. Procedural checklists are editorial requirements, not hardware measurements.

Back to first citation ↑
C190ASource checked · pending review

Intel documents an 8-pin / 2x4 +12 V processor-power connector form in the cited ATX design guide.

Intel · ATX Version 3.0 — +12 V Power Connector ↗

Locator: +12 V CPU power connector section
Access: public page. Identification/reference scope only. V36 does not convert this source into a universal pinout, fabrication drawing, electrical approval or end-to-end compatibility verdict.

S198: full source recordInspect review dependencies → (private workspace)

Claim scope: V36 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction or end-to-end compatibility proof.. Next review due 2027-01-03.

Back to first citation ↑
C190CSource checked · pending review

CORSAIR illustrates the CPU-power cable role with an EPS12V 4+4 arrangement; the split is an example, not a requirement for every EPS cable.

CORSAIR · Which PSU cables go where? — EPS and PCIe sections ↗

Locator: 4-pin ATX12V / 8-pin EPS12V and 6-pin / 6+2-pin PCIe sections. Text inspected; linked product images could not be retrieved.
Access: public page. Only the exact named source/example supports the observation. No universal mating, wiring, maximum rating or mechanical tolerance is inferred. Not identified; retrieval is not a revision date.

S474: full source recordInspect review dependencies → (private workspace)

Claim scope: Cable-division concept only; exact face geometry was not inspected.. Next review due 2027-01-09.

Back to first citation ↑
C190DSource checked · pending review

CORSAIR warns that Type 3 and Type 4 modular PSU cables are not compatible with Type 5 power supplies.

CORSAIR · PSU cable compatibility — Type 3/4 versus Type 5 warning ↗

Locator: Disclaimer item 3; cable-type headings. The model chart icon cells are not interpreted.
Access: public page. Exact source and example only; no device approval, universal rating, wiring or manufacturing tolerance is inferred. Remote raw-file retention is reported separately.

S489: full source recordInspect review dependencies → (private workspace)

Claim scope: This separate PSU-end check is not resolved by identifying an EPS12V component-end connector.. Next review due 2027-01-09.

Back to first citation ↑
C190ESource checked · pending review

CORSAIR describes more than one processor-power input arrangement and directs the reader to the motherboard manual to determine whether both eight-position CPU inputs are required.

CORSAIR · CORSAIR power-cable guide — required inputs and connector location ↗

Locator: 4-pin ATX12V / 8-pin EPS12V and 6-pin / 6+2-pin PCIe sections; accompanying physical images were not visually inspectable.
Access: public page. No independent review, wiring, current rating, mating or fabrication approval. Retrieval status and document revision retained.

S560: full source recordInspect review dependencies → (private workspace)

Claim scope: The documented configurations are examples; connector count alone does not determine an unknown motherboard’s requirements.. Next review due 2027-01-10.

Back to first citation ↑
C190WSource checked · pending review

SSI names Molex 39-01-2080 for its eight-position 2 × 4 processor/memory power connector. The exact Molex housing specification lists two rows and 4.20 mm mating-interface pitch.

Molex · Molex39-01-2080/39012080 receptacle housing physical specifications ↗

Locator: Physical Specifications: Number Of Rows2; Pitch Mating Interface4.20mm; Keywords39-01-2080/0039012080. SSI S760 section4.2.2 PDF/printedp12 explicitly names this eight-position housing and2x4 processor/memory connectors; full PDF text and150dpi page pixels inspected.
Access: public page. Empty housing is not assembled EPS harness. No loaded contacts, cable wiring, PSU-side shape, generic Mini-Fit key pattern or power compatibility established; live page says Limited Information Available.

S977: full source recordSSI Forum (archive hosted by SNIA) · Power Supply Design Guideline for 2008 Dual-Socket Servers and Workstations (A Server System Infrastructure Specification) ↗

Locator: Section 4.2.1, Table 3 P1 Baseboard Power Connector, printed p. 10; Section 4.2.2, Table 4 Processor 0 / memory power Connector, printed p. 12; Section 4.2.2, Table 5 Processor 1 / memory power Connector, printed p. 12; Section 4.2.4, Table 7 Peripheral Power Connectors (Amp 1-480424-0), printed p. 13; Section 4.2.5, Table 8 Floppy Power Connector (Amp 171822-4), printed p. 13; Section 4.2.8, Table 11 PCI Express Graphic Card Power Connector(s), printed p. 15
Access: public pdf text. Source scope and unresolved evidence are preserved in the engineering variant.

S760: full source recordInspect review dependencies → (private workspace)

Claim scope: Exact Molex39-01-2080 receptacle housing named in SSI PSDG2008v1.2.1 section4.2.2, component geometry only.. Next review due 2027-01-20.

Suggest a correction to this field note →

Put this field note to work.

Add to discovery trayRecord an unsaved candidate (private workspace)

Compare look-alikes: 8-pin CPU power versus 8-pin PCIe auxiliary power

Candidate selection does not confirm the identity or capabilities of your physical item.

Use this reference

From identity to the right next question

POWER ROLES / COMPONENT & DOCUMENT IDENTITY

Check the role before the resemblance.

EPS12V / motherboard side

Role
Processor-power input, not an arbitrary PSU socket.
Distinction
One or more inputs may be documented.
Established
The motherboard manual determines the required connections.
Not established
An unknown board’s input requirement is not inferred from a photograph.
Next check
Read the exact board manual and retain its connector labels.
Evidence, revision & limits

Observed . C190E

CORSAIR power-cable guide — required inputs and connector location ↗
4-pin ATX12V / 8-pin EPS12V and 6-pin / 6+2-pin PCIe sections; accompanying physical images were not visually inspectable.
S560 · canonical observation date 2026-10-12. Equipment-side roles and the instruction to consult the motherboard manual. The article includes motherboard PCIe-power examples. Its images do not qualify as inspected physical specimens here.

Observation date is not a document issue date. No hardware, wiring, seating, fit or independent approval.

No new physical view closes this reference’s image request in V137. Concepts are not specimen substitutes.

Read the power reference and open-image ledger →

Evidence behind this page

Scope first. Source second. Approval separate.

6 linked sources · 5 scoped claims · 0 sources with inspection/access flags.

Page scope: catalogue_expansion_v36

Assessment 2026-10-22 · earliest scheduled source review 2027-01-03. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 6 source scopes, access limits and dates

S198 · ATX Version 3.0 — +12 V Power Connector

Intel · Manufacturer / product-owner domain · inspected 2026-10-05 · due 2027-01-03

Within inspection window

Scoped support: Documents 4-pin and 8-pin +12 V processor power connector forms; V36 uses only the 8-pin form for identification.

Not established / limitations: Identification/reference scope only. V36 does not convert this source into a universal pinout, fabrication drawing, electrical approval or end-to-end compatibility verdict.

Locator: +12 V CPU power connector section

S474 · Which PSU cables go where? — EPS and PCIe sections

CORSAIR · Unclassified publisher domain · inspected 2026-10-11 · due 2027-01-09

Within inspection window

Scoped support: Split-cable examples and CPU/PCIe role distinction only. No physical mating-face art is authorized by this text inspection.

Not established / limitations: Only the exact named source/example supports the observation. No universal mating, wiring, maximum rating or mechanical tolerance is inferred. Not identified; retrieval is not a revision date.

Locator: 4-pin ATX12V / 8-pin EPS12V and 6-pin / 6+2-pin PCIe sections. Text inspected; linked product images could not be retrieved.

S489 · PSU cable compatibility — Type 3/4 versus Type 5 warning

CORSAIR · Unclassified publisher domain · inspected 2026-10-11 · due 2027-01-09

Within inspection window

Scoped support: CORSAIR modular PSU cable types only; not cross-brand compatibility.

Not established / limitations: Exact source and example only; no device approval, universal rating, wiring or manufacturing tolerance is inferred. Remote raw-file retention is reported separately.

Locator: Disclaimer item 3; cable-type headings. The model chart icon cells are not interpreted.

S560 · CORSAIR power-cable guide — required inputs and connector location

CORSAIR · Unclassified publisher domain · inspected 2026-10-12 · due 2027-01-10

Within inspection window

Scoped support: Equipment-side roles and the instruction to consult the motherboard manual. The article includes motherboard PCIe-power examples. Its images do not qualify as inspected physical specimens here.

Not established / limitations: No independent review, wiring, current rating, mating or fabrication approval. Retrieval status and document revision retained.

Locator: 4-pin ATX12V / 8-pin EPS12V and 6-pin / 6+2-pin PCIe sections; accompanying physical images were not visually inspectable.

S760 · Power Supply Design Guideline for 2008 Dual-Socket Servers and Workstations (A Server System Infrastructure Specification)

SSI Forum (archive hosted by SNIA) · Standards-organization domain · inspected 2026-10-20 · due 2027-01-18

Within inspection window

Scoped support: Exact named pinout variant only; not capability or compatibility approval.

Not established / limitations: Source scope and unresolved evidence are preserved in the engineering variant.

Locator: Section 4.2.1, Table 3 P1 Baseboard Power Connector, printed p. 10; Section 4.2.2, Table 4 Processor 0 / memory power Connector, printed p. 12; Section 4.2.2, Table 5 Processor 1 / memory power Connector, printed p. 12; Section 4.2.4, Table 7 Peripheral Power Connectors (Amp 1-480424-0), printed p. 13; Section 4.2.5, Table 8 Floppy Power Connector (Amp 171822-4), printed p. 13; Section 4.2.8, Table 11 PCI Express Graphic Card Power Connector(s), printed p. 15

S977 · Molex39-01-2080/39012080 receptacle housing physical specifications

Molex · Manufacturer / product-owner domain · inspected 2026-10-22 · due 2027-01-20

Within inspection window

Scoped support: Exact housing binding to SSI processor/memory power connectors.

Not established / limitations: Empty housing is not assembled EPS harness. No loaded contacts, cable wiring, PSU-side shape, generic Mini-Fit key pattern or power compatibility established; live page says Limited Information Available.

Locator: Physical Specifications: Number Of Rows2; Pitch Mating Interface4.20mm; Keywords39-01-2080/0039012080. SSI S760 section4.2.2 PDF/printedp12 explicitly names this eight-position housing and2x4 processor/memory connectors; full PDF text and150dpi page pixels inspected.

Trace 5 claims to their source records

C190A · P190

Intel documents an 8-pin / 2x4 +12 V processor-power connector form in the cited ATX design guide.

Claim scope: V36 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction or end-to-end compatibility proof.

Source links: S198 · Evidence trail → (private workspace)

C190C · P190

CORSAIR illustrates the CPU-power cable role with an EPS12V 4+4 arrangement; the split is an example, not a requirement for every EPS cable.

Claim scope: Cable-division concept only; exact face geometry was not inspected.

Source links: S474 · Evidence trail → (private workspace)

C190D · P190

CORSAIR warns that Type 3 and Type 4 modular PSU cables are not compatible with Type 5 power supplies.

Claim scope: This separate PSU-end check is not resolved by identifying an EPS12V component-end connector.

Source links: S489 · Evidence trail → (private workspace)

C190E · P190

CORSAIR describes more than one processor-power input arrangement and directs the reader to the motherboard manual to determine whether both eight-position CPU inputs are required.

Claim scope: The documented configurations are examples; connector count alone does not determine an unknown motherboard’s requirements.

Source links: S560 · Evidence trail → (private workspace)

C190W · P190

SSI names Molex 39-01-2080 for its eight-position 2 × 4 processor/memory power connector. The exact Molex housing specification lists two rows and 4.20 mm mating-interface pitch.

Claim scope: Exact Molex39-01-2080 receptacle housing named in SSI PSDG2008v1.2.1 section4.2.2, component geometry only.

Source links: S977 · S760 · Evidence trail → (private workspace)

Prepare this page for review → (private workspace)Read the evidence method →

Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.