E190 · Source-scoped pinout variants

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

Intel ATX Version 3.0 +12 V 8-pin processor-power assignment.

Open field note Source trail

Source checked · no independent review claimed · Fabrication approved: no

8-pin +12 V CPU-power logical assignment original orientation schematic — Original pinout diagram; read the exact variant and view below. Not to scale.

Contact count

8

processor-power cable plug / motherboard header interface

Mating boundary

Shape is not the verdict.

8-pin +12 V processor-power cable plug ↔ compatible motherboard header

Orientation

How to read this profile

Logical table numbering from Intel Table 5-9; V37 deliberately does not infer mating-face orientation from the assignment table.

Source-scoped identification facts

Each value retains its exact example, role and measurement axis. Facts from different parts must not be combined into an invented component.

Documented examples; not a mating drawing or compatibility approval
Nominal contacts	8S198Documented position count only; V36 does not publish the electrical assignment.
Positions / cavity span	8 (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.
Contact rows	2 (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 pitch	4.2 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.
Connector role	plug; headerS198 · S215Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. processor-power cable plug / motherboard header interface
Keying / polarization	square 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.
Exact part / implementation	MSI 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.
View convention	MSI 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.

Not recorded: Populated contacts, Dimensions / axis, Contact gender / arrangement, Mounting, Coupling / latch, Shell / form, Manufacturer, Series, Recorded markings. Unknown fields stay unknown; illustrations supply no measurements or pin assignments.

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 these facts →

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.

Dark pinout view

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 variantIntel ATX v3 +12 V Power 8-pin connector

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.

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
Pin	Signal	What it does	Status
1	COM	Ground reference and return.	Confirmed Sources
2	COM	Ground reference and return.	Confirmed Sources
3	COM	Ground reference and return.	Confirmed Sources
4	COM	Ground reference and return.	Confirmed Sources
5	+12V2 DC	Power connection (+12V2 DC). Check the specified supply.	Confirmed Sources
6	+12V2 DC	Power connection (+12V2 DC). Check the specified supply.	Confirmed Sources
7	+12V2 DC	Power connection (+12V2 DC). Check the specified supply.	Confirmed Sources
8	+12V2 DC	Power connection (+12V2 DC). Check the specified supply.	Confirmed Sources

Sources (3)

S755 · Intel Corporation · ATX Version 3 Multi Rail Desktop Platform Power Supply Design Guide
Document 336521, Revision 2.1a, November 2023 · Section 5.2.2.5, Table 5-9 +12 V Power 8 pin Connector Pin-Out, printed p. 67
S763 · Intel Corporation · ATX Version 3 Multi Rail Desktop Platform Power Supply Design Guide
2.1a; web date 11/01/2023 · Mechanical > Connectors > DC Connectors > +12 V Power Connector, Table 5-9: +12 V Power 8 pin Connector Pin-Out
S757 · Micro-Star International (MSI) · B550-A PRO User Guide
Version 6.0, 2024/02, First release (Revision History, PDF p.59) · printed/PDF p.34, CPU_PWR1, ATX_PWR1: Power Connectors, CPU_PWR1, numbered drawing and Pin/Signal Name table

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.

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
Pin	Signal	What it does	Status
1	COM	Ground reference and return.	Confirmed Sources
2	COM	Ground reference and return.	Confirmed Sources
3	COM	Ground reference and return.	Confirmed Sources
4	COM	Ground reference and return.	Confirmed Sources
5	+12 V1	Power connection (+12 V1). Check the specified supply.	Single source Sources
6	+12 V1	Power connection (+12 V1). Check the specified supply.	Single source Sources
7	+12 V3a	Power connection (+12 V3a). Check the specified supply.	Single source Sources
8	+12 V3a	Power connection (+12 V3a). Check the specified supply.	Single source Sources

Sources (3)

S760 · SSI Forum (archive hosted by SNIA) · Power Supply Design Guideline for 2008 Dual-Socket Servers and Workstations (A Server System Infrastructure Specification)
Version 1.2.1 (copyright 2008-2012 SSI Forum) · Section 4.2.2, Table 4 Processor 0 / memory power Connector, printed p. 12
S763 · Intel Corporation · ATX Version 3 Multi Rail Desktop Platform Power Supply Design Guide
2.1a; web date 11/01/2023 · Mechanical > Connectors > DC Connectors > +12 V Power Connector, Table 5-9: +12 V Power 8 pin Connector Pin-Out
S757 · Micro-Star International (MSI) · B550-A PRO User Guide
Version 6.0, 2024/02, First release (Revision History, PDF p.59) · printed/PDF p.34, CPU_PWR1, ATX_PWR1: Power Connectors, CPU_PWR1, numbered drawing and Pin/Signal Name table

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.

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
Pin	Signal	What it does	Status
1	COM	Ground reference and return.	Confirmed Sources
2	COM	Ground reference and return.	Confirmed Sources
3	COM	Ground reference and return.	Confirmed Sources
4	COM	Ground reference and return.	Confirmed Sources
5	+12 V2	Power connection (+12 V2). Check the specified supply.	Confirmed Sources
6	+12 V2	Power connection (+12 V2). Check the specified supply.	Confirmed Sources
7	+12 V3b	Power connection (+12 V3b). Check the specified supply.	Single source Sources
8	+12 V3b	Power connection (+12 V3b). Check the specified supply.	Single source Sources

Sources (3)

S760 · SSI Forum (archive hosted by SNIA) · Power Supply Design Guideline for 2008 Dual-Socket Servers and Workstations (A Server System Infrastructure Specification)
Version 1.2.1 (copyright 2008-2012 SSI Forum) · Section 4.2.2, Table 5 Processor 1 / memory power Connector, printed p. 12
S763 · Intel Corporation · ATX Version 3 Multi Rail Desktop Platform Power Supply Design Guide
2.1a; web date 11/01/2023 · Mechanical > Connectors > DC Connectors > +12 V Power Connector, Table 5-9: +12 V Power 8 pin Connector Pin-Out
S757 · Micro-Star International (MSI) · B550-A PRO User Guide
Version 6.0, 2024/02, First release (Revision History, PDF p.59) · printed/PDF p.34, CPU_PWR1, ATX_PWR1: Power Connectors, CPU_PWR1, numbered drawing and Pin/Signal Name table

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.

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
Pin	Signal	What it does	Status
1	Ground	Ground reference and return.	Device-specific Sources
2	Ground	Ground reference and return.	Device-specific Sources
3	Ground	Ground reference and return.	Device-specific Sources
4	Ground	Ground reference and return.	Device-specific Sources
5	+12V	Power connection (+12V). Check the specified supply.	Device-specific Sources
6	+12V	Power connection (+12V). Check the specified supply.	Device-specific Sources
7	+12V	Power connection (+12V). Check the specified supply.	Device-specific Sources
8	+12V	Power connection (+12V). Check the specified supply.	Device-specific Sources

Sources (1)

S761 · Micro-Star International (MSI) · MAG B550 TOMAHAWK Motherboard User Guide (multilingual)
No revision printed; PDF creation date 2023-12-26 (file MAGB550TOMAHAWK.pdf) · English section, 'CPU_PWR1, ATX_PWR1: Power Connectors', CPU_PWR1 table, printed p. 20

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.

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
Pin	Signal	What it does	Status
1	GND (Only for 2x4-pin 12V)	Ground reference and return.	Device-specific Sources
2	GND (Only for 2x4-pin 12V)	Ground reference and return.	Device-specific Sources
3	GND	Ground reference and return.	Device-specific Sources
4	GND	Ground 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	+12V	Power connection (+12V). Check the specified supply.	Device-specific Sources
8	+12V	Power connection (+12V). Check the specified supply.	Device-specific Sources

Sources (1)

S762 · GIGA-BYTE Technology · B550 AORUS ELITE / B550 AORUS ELITE AX User's Manual
Rev. 1002, 12ME-B55AELT-1002R (copyright 2020) · Chapter 1, item 1/2) ATX_12V/ATX, 'ATX_12V:' pin table, printed p. 15

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.

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
Pin	Signal	What it does	Status
1	COM	Ground reference and return.	Confirmed Sources
2	COM	Ground reference and return.	Confirmed Sources
3	COM	Ground reference and return.	Confirmed Sources
4	COM	Ground reference and return.	Confirmed Sources
5	+12V2 DC	Power connection (+12V2 DC). Check the specified supply.	Confirmed Sources
6	+12V2 DC	Power connection (+12V2 DC). Check the specified supply.	Confirmed Sources
7	+12V2 DC	Power connection (+12V2 DC). Check the specified supply.	Confirmed Sources
8	+12V2 DC	Power connection (+12V2 DC). Check the specified supply.	Confirmed Sources

Sources (5)

S763 · Intel Corporation · ATX Version 3 Multi Rail Desktop Platform Power Supply Design Guide
2.1a; web date 11/01/2023 · Mechanical > Connectors > DC Connectors > +12 V Power Connector, Table 5-9: +12 V Power 8 pin Connector Pin-Out
S755 · Intel Corporation · ATX Version 3 Multi Rail Desktop Platform Power Supply Design Guide
Document 336521, Revision 2.1a, November 2023 · Section 5.2.2.5, Table 5-9 +12 V Power 8 pin Connector Pin-Out, printed p. 67
S760 · SSI Forum (archive hosted by SNIA) · Power Supply Design Guideline for 2008 Dual-Socket Servers and Workstations (A Server System Infrastructure Specification)
Version 1.2.1 (copyright 2008-2012 SSI Forum) · 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
S761 · Micro-Star International (MSI) · MAG B550 TOMAHAWK Motherboard User Guide (multilingual)
No revision printed; PDF creation date 2023-12-26 (file MAGB550TOMAHAWK.pdf) · English section, 'CPU_PWR1, ATX_PWR1: Power Connectors', CPU_PWR1 table, printed p. 20
S762 · GIGA-BYTE Technology · B550 AORUS ELITE / B550 AORUS ELITE AX User's Manual
Rev. 1002, 12ME-B55AELT-1002R (copyright 2020) · Chapter 1, item 1/2) ATX_12V/ATX, 'ATX_12V:' pin table, printed p. 15

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.

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
Pin	Signal	What it does	Status
1	Ground	Ground reference and return.	Device-specific Sources
2	Ground	Ground reference and return.	Device-specific Sources
3	Ground	Ground reference and return.	Device-specific Sources
4	Ground	Ground reference and return.	Device-specific Sources
5	+12V	Power connection (+12V). Check the specified supply.	Device-specific Sources
6	+12V	Power connection (+12V). Check the specified supply.	Device-specific Sources
7	+12V	Power connection (+12V). Check the specified supply.	Device-specific Sources
8	+12V	Power connection (+12V). Check the specified supply.	Device-specific Sources

Sources (1)

S757 · Micro-Star International (MSI) · B550-A PRO User Guide
Version 6.0, 2024/02, First release (Revision History, PDF p.59) · printed/PDF p.34, CPU_PWR1, ATX_PWR1: Power Connectors, CPU_PWR1, numbered drawing and Pin/Signal Name table

Unknowns stay unknown.

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.

Your next step

Use the detail without guessing past its limits.

Read the connector field note Recognition clues and practical checks.Work through a connection Keep exact equipment and cable requirements separate.

Source trail

Claims and sources

C190Asource checked

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

C190Bsource checked

Intel ATX Version 3.0 Table 5-9 assigns positions 1–4 of the documented 8-pin +12 V processor-power connector to COM and positions 5–8 to +12V2 DC.

Intel · ATX Version 3.0 — +12 V 8-pin power connector pin-out ↗
Table 5-9 +12 V Power 8 Pin Connector Pin-Out · Logical assignment table only. V37 does not infer modular-PSU pinouts, face orientation or safe substitution from the motherboard-side standard connector.

C806Csource checked

Intel ATX v3 +12 V Power 8-pin connector: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Intel Corporation · ATX Version 3 Multi Rail Desktop Platform Power Supply Design Guide ↗
Revision history entry for 2.1 (printed p. 13): 12VHPWR renamed 12V-2x6 throughout, 'Cable Plug' side unchanged; Section 5.2.2.4.3 'Special Note on 12V-2x6 vs. 12VHPWR connectors' (printed p. 61); Table 5-7 (printed p. 66); Section 5.2.2.1, Table 5-1 Main Power Connector Pin-Out, printed p. 55; Section 5.2.2.2 Peripheral Connectors (AMP 1-480424-0 or Molex 15-24-4048), Table 5-2 Peripheral Connector Pin-out, printed pp. 55-56; Section 5.2.2.3 Floppy Drive Connector - Do Not Include (For Historical Reference Only), AMP 171822-4, Table 5-3 Floppy Connector Pin-out, printed p. 56; Section 5.2.2.4.1, Table 5-4 PCIe 2x3 Auxiliary Power Connector Pin Assignment (75 watts) and note 2, printed p. 57; Section 5.2.2.4.2, Table 5-5 PCIe 2x4 Auxiliary Power Connector Pin Assignment (150 Watts) and Table 5-6 Sense Pin Decoding, printed p. 58; Section 5.2.2.4.3, Table 5-7 PCIe 12V-2x6 Auxiliary Power Connector Pin Assignment (600 watts), printed p. 66; sideband definitions Section 3.3 and Table 3-6, printed pp. 29-32; Section 5.2.2.5, Table 5-9 +12 V Power 8 pin Connector Pin-Out, printed p. 67 · Source scope and unresolved evidence are preserved in the engineering variant.

Micro-Star International (MSI) · B550-A PRO User Guide ↗
printed/PDF p.33, JAUD1: Front Audio Connector, numbered drawing and Pin/Signal Name table; printed/PDF p.34, CPU_PWR1, ATX_PWR1: Power Connectors, ATX_PWR1, numbered drawing and Pin/Signal Name table; printed/PDF p.34, CPU_PWR1, ATX_PWR1: Power Connectors, CPU_PWR1, numbered drawing and Pin/Signal Name table; printed/PDF p.37, JUSB1~2: USB 2.0 Connectors, numbered drawing and Pin/Signal Name table; printed/PDF p.38, CPU_FAN1, PUMP_FAN1, SYS_FAN1~6: Fan Connectors, PWM Mode and DC Mode pin definition tables and mode explanation, numbered drawing and Pin/Signal Name table; printed/PDF p.40, JRGB1: RGB LED connector, numbered drawing and Pin/Signal Name table; printed/PDF p.41, JRAINBOW1~2: Addressable RGB LED connectors, numbered drawing and Pin/Signal Name table · Source scope and unresolved evidence are preserved in the engineering variant.

Intel Corporation · ATX Version 3 Multi Rail Desktop Platform Power Supply Design Guide ↗
Mechanical > Connectors > DC Connectors > +12 V Power Connector, Table 5-9: +12 V Power 8 pin Connector Pin-Out · Source scope and unresolved evidence are preserved in the engineering variant.

C806Dsource checked

SSI 2008 PSDG processor 0 / memory 2x4 connector (Molex 39-01-2080): original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

SSI Forum (archive hosted by SNIA) · Power Supply Design Guideline for 2008 Dual-Socket Servers and Workstations (A Server System Infrastructure Specification) ↗
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 · Source scope and unresolved evidence are preserved in the engineering variant.

C806Esource checked

SSI 2008 PSDG processor 1 / memory 2x4 connector (Molex 39-01-2080): original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

C806Fsource checked

MSI MAG B550 TOMAHAWK CPU_PWR1 board header: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Micro-Star International (MSI) · MAG B550 TOMAHAWK Motherboard User Guide (multilingual) ↗
English section, 'CPU_FAN1, PUMP_FAN1, SYS_FAN1~6: Fan Connectors', PWM Mode and DC Mode pin definition tables, printed p. 23; English section, 'CPU_PWR1, ATX_PWR1: Power Connectors', CPU_PWR1 table, printed p. 20; English section, 'JAUD1: Front Audio Connector' table, printed p. 19; English section, 'JRAINBOW1~2: Addressable RGB LED connectors' table, printed p. 27; English section, 'JRGB1~2: RGB LED connectors' table, printed p. 26; English section, 'JUSB1~2: USB 2.0 Connectors' table, printed p. 22; English section, Overview of Components, 'CPU_PWR1, ATX_PWR1: Power Connectors', ATX_PWR1 table, printed p. 20 · Source scope and unresolved evidence are preserved in the engineering variant.

C806Gsource checked

GIGABYTE B550 AORUS ELITE (AX) ATX_12V board header: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

GIGA-BYTE Technology · B550 AORUS ELITE / B550 AORUS ELITE AX User's Manual ↗
Chapter 1, item 1/2) ATX_12V/ATX, 'ATX:' pin table, printed p. 15; Chapter 1, item 1/2) ATX_12V/ATX, 'ATX_12V:' pin table, printed p. 15; Chapter 1, item 12) F_AUDIO (Front Panel Audio Header), High Definition audio table, printed p. 19; Chapter 1, item 14) F_USB1/F_USB2 (USB 2.0/1.1 Headers) table, printed p. 20; Chapter 1, item 3/4) CPU_FAN/SYS_FAN1/2/3 (Fan Headers) pin table, printed p. 15; item 5) CPU_OPT, printed p. 16; Chapter 1, item 7) D_LED1/D_LED2 (Addressable LED Strip Headers), printed p. 16; Chapter 1, item 8) LED_C1/LED_C2 (RGB LED Strip Headers), printed p. 17; item 6) LED_CPU, printed p. 16 · Source scope and unresolved evidence are preserved in the engineering variant.

C806Hsource checked

Intel rev 2.1a eight-pin CPU power: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

C806Isource checked

MSI B550-A PRO CPU_PWR1: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

C190Wsource checked

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 ↗
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. · 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.

9 source records support this profile. No independent engineering review or hardware validation is claimed.

Evidence behind this page

Scope first. Source second. Approval separate.

9 linked sources · 10 scoped claims · 0 sources with inspection/access flags.

Page scope: Original V37 logical-assignment schematic; not to scale and not a mating-face or manufacturing drawing.

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 9 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

S215 · ATX Version 3.0 — +12 V 8-pin power connector pin-out

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

Within inspection window

Scoped support: Engineering-sidecar source for the documented 8-position +12 V processor-power logical assignments.

Not established / limitations: Logical assignment table only. V37 does not infer modular-PSU pinouts, face orientation or safe substitution from the motherboard-side standard connector.

Locator: Table 5-9 +12 V Power 8 Pin Connector Pin-Out

S755 · ATX Version 3 Multi Rail Desktop Platform Power Supply Design Guide

Intel Corporation · Manufacturer / product-owner 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: Revision history entry for 2.1 (printed p. 13): 12VHPWR renamed 12V-2x6 throughout, 'Cable Plug' side unchanged; Section 5.2.2.4.3 'Special Note on 12V-2x6 vs. 12VHPWR connectors' (printed p. 61); Table 5-7 (printed p. 66); Section 5.2.2.1, Table 5-1 Main Power Connector Pin-Out, printed p. 55; Section 5.2.2.2 Peripheral Connectors (AMP 1-480424-0 or Molex 15-24-4048), Table 5-2 Peripheral Connector Pin-out, printed pp. 55-56; Section 5.2.2.3 Floppy Drive Connector - Do Not Include (For Historical Reference Only), AMP 171822-4, Table 5-3 Floppy Connector Pin-out, printed p. 56; Section 5.2.2.4.1, Table 5-4 PCIe 2x3 Auxiliary Power Connector Pin Assignment (75 watts) and note 2, printed p. 57; Section 5.2.2.4.2, Table 5-5 PCIe 2x4 Auxiliary Power Connector Pin Assignment (150 Watts) and Table 5-6 Sense Pin Decoding, printed p. 58; Section 5.2.2.4.3, Table 5-7 PCIe 12V-2x6 Auxiliary Power Connector Pin Assignment (600 watts), printed p. 66; sideband definitions Section 3.3 and Table 3-6, printed pp. 29-32; Section 5.2.2.5, Table 5-9 +12 V Power 8 pin Connector Pin-Out, printed p. 67

S757 · B550-A PRO User Guide

Micro-Star International (MSI) · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19

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: printed/PDF p.33, JAUD1: Front Audio Connector, numbered drawing and Pin/Signal Name table; printed/PDF p.34, CPU_PWR1, ATX_PWR1: Power Connectors, ATX_PWR1, numbered drawing and Pin/Signal Name table; printed/PDF p.34, CPU_PWR1, ATX_PWR1: Power Connectors, CPU_PWR1, numbered drawing and Pin/Signal Name table; printed/PDF p.37, JUSB1~2: USB 2.0 Connectors, numbered drawing and Pin/Signal Name table; printed/PDF p.38, CPU_FAN1, PUMP_FAN1, SYS_FAN1~6: Fan Connectors, PWM Mode and DC Mode pin definition tables and mode explanation, numbered drawing and Pin/Signal Name table; printed/PDF p.40, JRGB1: RGB LED connector, numbered drawing and Pin/Signal Name table; printed/PDF p.41, JRAINBOW1~2: Addressable RGB LED connectors, numbered drawing and Pin/Signal Name table

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

S761 · MAG B550 TOMAHAWK Motherboard User Guide (multilingual)

Micro-Star International (MSI) · Unclassified publisher 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: English section, 'CPU_FAN1, PUMP_FAN1, SYS_FAN1~6: Fan Connectors', PWM Mode and DC Mode pin definition tables, printed p. 23; English section, 'CPU_PWR1, ATX_PWR1: Power Connectors', CPU_PWR1 table, printed p. 20; English section, 'JAUD1: Front Audio Connector' table, printed p. 19; English section, 'JRAINBOW1~2: Addressable RGB LED connectors' table, printed p. 27; English section, 'JRGB1~2: RGB LED connectors' table, printed p. 26; English section, 'JUSB1~2: USB 2.0 Connectors' table, printed p. 22; English section, Overview of Components, 'CPU_PWR1, ATX_PWR1: Power Connectors', ATX_PWR1 table, printed p. 20

S762 · B550 AORUS ELITE / B550 AORUS ELITE AX User's Manual

GIGA-BYTE Technology · Unclassified publisher domain · inspected 2026-10-21 · due 2027-01-19

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: Chapter 1, item 1/2) ATX_12V/ATX, 'ATX:' pin table, printed p. 15; Chapter 1, item 1/2) ATX_12V/ATX, 'ATX_12V:' pin table, printed p. 15; Chapter 1, item 12) F_AUDIO (Front Panel Audio Header), High Definition audio table, printed p. 19; Chapter 1, item 14) F_USB1/F_USB2 (USB 2.0/1.1 Headers) table, printed p. 20; Chapter 1, item 3/4) CPU_FAN/SYS_FAN1/2/3 (Fan Headers) pin table, printed p. 15; item 5) CPU_OPT, printed p. 16; Chapter 1, item 7) D_LED1/D_LED2 (Addressable LED Strip Headers), printed p. 16; Chapter 1, item 8) LED_C1/LED_C2 (RGB LED Strip Headers), printed p. 17; item 6) LED_CPU, printed p. 16

S763 · ATX Version 3 Multi Rail Desktop Platform Power Supply Design Guide

Intel Corporation · Manufacturer / product-owner domain · inspected 2026-10-21 · due 2027-01-19

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: Mechanical > Connectors > DC Connectors > +12 V Power Connector, Table 5-9: +12 V Power 8 pin Connector Pin-Out

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 10 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)

C190B · P190

Intel ATX Version 3.0 Table 5-9 assigns positions 1–4 of the documented 8-pin +12 V processor-power connector to COM and positions 5–8 to +12V2 DC.

Claim scope: V37 engineering-depth sidecar fact; source-checked but not independently human-approved, not a fabrication drawing, and not a safe-substitution or repair instruction.

Source links: S215 · 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)

C806C · P190

Intel ATX v3 +12 V Power 8-pin connector: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S755 · S757 · S763 · Evidence trail → (private workspace)

C806D · P190

SSI 2008 PSDG processor 0 / memory 2x4 connector (Molex 39-01-2080): original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S757 · S760 · S763 · Evidence trail → (private workspace)

C806E · P190

SSI 2008 PSDG processor 1 / memory 2x4 connector (Molex 39-01-2080): original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S757 · S760 · S763 · Evidence trail → (private workspace)

C806F · P190

MSI MAG B550 TOMAHAWK CPU_PWR1 board header: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S761 · Evidence trail → (private workspace)

C806G · P190

GIGABYTE B550 AORUS ELITE (AX) ATX_12V board header: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S762 · Evidence trail → (private workspace)

C806H · P190

Intel rev 2.1a eight-pin CPU power: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S755 · S760 · S761 · S762 · S763 · Evidence trail → (private workspace)

C806I · P190

MSI B550-A PRO CPU_PWR1: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Claim scope: Pinout variant only; see comparison and per-contact status. Not fabrication approval.

Source links: S757 · Evidence trail → (private workspace)

Prepare this page for review →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.