FIELD GUIDESource-led reference

P191 / PC power / Connector

PCIe 6-pin auxiliary power connector

The legacy PCI Express auxiliary-power family includes a six-position 2x3 connector form.

Also called PCIe 6 pin GPU 6 pin 2x3 PCIe power

A PCIe auxiliary-power connector is not a general-purpose keyed DC connector.

Look for

Match the PSU cable label and graphics-card manual; do not repin, force or adapt based only on shell size.

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

Image inspection / P191

See the view. Check its scope.

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

Six positions are not a complete system verdict. Conceptual role comparison; no cavity keying or contact assignment. Original qualitative study; no wiring, fit or installation approval. (private workspace)

P191 / Concept — not physical geometry

Six positions are not a complete system verdict

CORSAIR 6+2 role note / Intel 2.01 design purpose

information hierarchy · Concept only

Not to scale. Technical and rights review pending.

Inspect view & provenance (private workspace)

The useful distinction

Recognize it. Then verify it.

The legacy PCI Express auxiliary-power family includes a six-position 2x3 connector form. [C191A]

Intel design-guide version 2.01 describes the PCIe 2x3 auxiliary connector as providing 75 watts to an add-in card. This is a dated design purpose, not a tested rating for an unidentified cable. [C191C]

The PCIe 2x3 subsection of Intel guide 2.01 describes a sense connection used by the add-in card to detect an attached auxiliary-power connector; a wiring location or modification is not supplied here. [C191D]

CORSAIR describes using only the six-position portion of a 6+2 PCIe cable for a six-position connection; its small two-position portion is separate. This does not authorize an arbitrary cable or power-supply-side substitution. [C191E]

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 contacts6S199Documented position count only; no V36 electrical pin map.
Positions / cavity span6 (PCIe six-position cable connector form)S570Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. V139 Source-scoped identification only. No complete cable assembly, universal mating, pin assignment, safe operating load, installation instruction or independent approval is established.
Contact rows2 (Source-described array; C191A); 2 (Source-described array; C191B); 2 (Source-described array; C191C); 2 (Source-described array; C191D); 2S199 · S216 · S572 · S572 · S755Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. V36 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction or end-to-end compatibility proof. V37 engineering-depth sidecar fact; source-checked but not independently human-approved, not a fabrication drawing, and not a safe-substitution or repair instruction. V139 Source-scoped identification only. No complete cable assembly, universal mating, pin assignment, safe operating load, installation instruction or independent approval is established. Intel336521Rev2.1a PCIe2x3 auxiliary. Documented role: cable plug. Noexactmaker/partinferred. Molex45559-0002partpagewasreadbuttheIntelcrossreferencewasnotestablished,sothatpartisnotassignedtoPCIe6pin.; 2x3denotes2rows3positions;no newnumberedfaceorpinout is created. Rating is not standalone assembly approval.
Contact pitch4.2 mm published2x3/2x4auxiliary contact pitchS755Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Intel336521Rev2.1a PCIe2x3 auxiliary. Documented role: cable plug. Noexactmaker/partinferred. Molex45559-0002partpagewasreadbuttheIntelcrossreferencewasnotestablished,sothatpartisnotassignedtoPCIe6pin.; 2x3denotes2rows3positions;no newnumberedfaceorpinout is created. Rating is not standalone assembly approval.
Connector roleplug; header; cable plugS199 · S216 · S755Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. PCIe auxiliary-power cable plug / add-in-card header interface Intel336521Rev2.1a PCIe2x3 auxiliary. Documented role: cable plug. Noexactmaker/partinferred. Molex45559-0002partpagewasreadbuttheIntelcrossreferencewasnotestablished,sothatpartisnotassignedtoPCIe6pin.; 2x3denotes2rows3positions;no newnumberedfaceorpinout is created. Rating is not standalone assembly approval.
SeriesIntel336521Rev2.1a PCIe2x3 auxiliaryS755Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Intel336521Rev2.1a PCIe2x3 auxiliary. Documented role: cable plug. Noexactmaker/partinferred. Molex45559-0002partpagewasreadbuttheIntelcrossreferencewasnotestablished,sothatpartisnotassignedtoPCIe6pin.; 2x3denotes2rows3positions;no newnumberedfaceorpinout is created. Rating is not standalone assembly approval.

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

Recorded variant and source limits
  • No mating-face orientation or key geometry is inferred from the assignment table.
  • This profile is not a modular PSU-side pinout and is not a substitute for the power-supply manufacturer documentation.
  • Intel ATX v3 PSU PCIe 2x3 (75 W) cable connector: Contact numbers per Table 5-4.
  • SSI 2008 PSDG workstation PCIe graphics 6-pin (Molex 45559-0002): Contact numbers per Table 11.
  • Intel rev 2.1a PCIe 2x3, 75 W: 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.
  • NVIDIA GRID K2 six-pin auxiliary connector: Use NVIDIA Figure 6 board connector drawing and its explicit #1 PIN and #4 PIN callouts. Table 2 defines numbers. No cable wire-side mapping established.
  • C191E / S570 separately describes the six-position PCIe connector body and the two-position detachable portion of a 6+2 cable end. The two-position portion is context only; it is not a second position count for this six-position form. Exact part, key geometry and cable assembly remain unresolved.
Report a correction to these facts →

Bounded facts, visible unknowns

Specifications and limits

PCIe 6-pin auxiliary power connector facts and limitations
Documented identification6-position 2x3 PCIe auxiliary-power form. [C191A]
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 PSU PCIe 2x3 (75 W) cable connector

View and evidence limits

Contact numbers per Table 5-4.

  • P191 PCIe 6-pin — **Agree**: 1-3 +12 V, 4/6 return, 5 grounded sense — Same Intel rev 2.1a in both. B independently adds NVIDIA GRID K2; A's SSI table calls pin 5 COM. This describes its grounded connection without disproving the detection role.
  • The PCI Express CEM specification is available only to PCI-SIG members (paywalled); its 2x3 table was not read. The card-side header assignment is not separately verified.
PCIe 6-pin auxiliary-power logical assignmentContact numbers per Table 5-4.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: +12V3/V4 (confirmed)12: +12V3/V4 (confirmed)23: +12V3/V4 (confirmed)34: COM (confirmed)45: Sense (confirmed)56: COM (confirmed)6powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Intel ATX v3 PSU PCIe 2x3 (75 W) cable connector — source-scoped contact map
PinSignalWhat it doesStatus
1+12V3/V4Power connection (+12V3/V4). Check the specified supply.Confirmed
Sources
2+12V3/V4Power connection (+12V3/V4). Check the specified supply.Confirmed
Sources
3+12V3/V4Power connection (+12V3/V4). Check the specified supply.Confirmed
Sources
4COMGround reference and return.Confirmed
Sources
5SenseControl, detection or configuration connection; check the source and device.Confirmed
Sources
6COMGround reference and return.Confirmed
Sources
Sources (3)

SSI 2008 PSDG workstation PCIe graphics 6-pin (Molex 45559-0002)

View and evidence limits

Contact numbers per Table 11.

  • P191 PCIe 6-pin — **Agree**: 1-3 +12 V, 4/6 return, 5 grounded sense — Same Intel rev 2.1a in both. B independently adds NVIDIA GRID K2; A's SSI table calls pin 5 COM. This describes its grounded connection without disproving the detection role.
  • The PCI Express CEM specification is available only to PCI-SIG members (paywalled); its 2x3 table was not read. The card-side header assignment is not separately verified.
PCIe 6-pin auxiliary-power logical assignmentContact numbers per Table 11.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: +12V4 / +12V5 (single_source)12: +12V4 / +12V5 (single_source)23: +12V4 / +12V5 (single_source)34: COM (confirmed)45: COM (single_source)56: COM (confirmed)6powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
SSI 2008 PSDG workstation PCIe graphics 6-pin (Molex 45559-0002) — source-scoped contact map
PinSignalWhat it doesStatus
1+12V4 / +12V5Power connection (+12V4 / +12V5). Check the specified supply.Single source
Sources
2+12V4 / +12V5Power connection (+12V4 / +12V5). Check the specified supply.Single source
Sources
3+12V4 / +12V5Power connection (+12V4 / +12V5). Check the specified supply.Single source
Sources
4COMGround reference and return.Confirmed
Sources
5COMGround reference and return.Single source
Sources
6COMGround reference and return.Confirmed
Sources
Sources (3)

Intel rev 2.1a PCIe 2x3, 75 W

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.

  • P191 PCIe 6-pin — **Agree**: 1-3 +12 V, 4/6 return, 5 grounded sense — Same Intel rev 2.1a in both. B independently adds NVIDIA GRID K2; A's SSI table calls pin 5 COM. This describes its grounded connection without disproving the detection role.
  • Proprietary six-pin connectors, modular PSU sockets, and unmarked cable rear views are unverified.
PCIe 6-pin auxiliary-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: +12V3/V4 (confirmed)12: +12V3/V4 (confirmed)23: +12V3/V4 (confirmed)34: COM (confirmed)45: Sense (confirmed)56: COM (confirmed)6powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
Intel rev 2.1a PCIe 2x3, 75 W — source-scoped contact map
PinSignalWhat it doesStatus
1+12V3/V4Power connection (+12V3/V4). Check the specified supply.Confirmed
Sources
2+12V3/V4Power connection (+12V3/V4). Check the specified supply.Confirmed
Sources
3+12V3/V4Power connection (+12V3/V4). Check the specified supply.Confirmed
Sources
4COMGround reference and return.Confirmed
Sources
5SenseControl, detection or configuration connection; check the source and device.Confirmed
Sources
6COMGround reference and return.Confirmed
Sources
Sources (3)

NVIDIA GRID K2 six-pin auxiliary connector

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

View and evidence limits

Use NVIDIA Figure 6 board connector drawing and its explicit #1 PIN and #4 PIN callouts. Table 2 defines numbers. No cable wire-side mapping established.

  • P191 PCIe 6-pin — **Agree**: 1-3 +12 V, 4/6 return, 5 grounded sense — Same Intel rev 2.1a in both. B independently adds NVIDIA GRID K2; A's SSI table calls pin 5 COM. This describes its grounded connection without disproving the detection role.
  • Proprietary six-pin connectors, modular PSU sockets, and unmarked cable rear views are unverified.
PCIe 6-pin auxiliary-power logical assignmentUse NVIDIA Figure 6 board connector drawing and its explicit #1 PIN and #4 PIN callouts. Table 2 defines numbers. No cable wire-side mapping established.SCHEMATIC · physical positions unconfirmedNot to scale · check the named wiring and device manual1: +12 V (device_specific)12: +12 V (device_specific)23: +12 V (device_specific)34: GND (device_specific)45: Sense (device_specific)56: GND (device_specific)6powergrounddataConfigshieldNCUnknown
Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.
NVIDIA GRID K2 six-pin auxiliary connector — source-scoped contact map
PinSignalWhat it doesStatus
1+12 VPower connection (+12 V). Check the specified supply.Device-specific
Sources
2+12 VPower connection (+12 V). Check the specified supply.Device-specific
Sources
3+12 VPower connection (+12 V). Check the specified supply.Device-specific
Sources
4GNDGround reference and return.Device-specific
Sources
5SenseControl, detection or configuration connection; check the source and device.Device-specific
Sources
6GNDGround reference and return.Device-specific
Sources
Sources (2)

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.

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 ↑
C191ASource checked · pending review

Intel documents a 2x3 PCIe add-in-card auxiliary-power connector form in the cited ATX design guide.

Intel · ATX Version 3.0 — PCI Express add-in card connectors ↗

Locator: PCIe auxiliary 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.

S199: 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 ↑
C191CSource checked · pending review

Intel design-guide version 2.01 describes the PCIe 2x3 auxiliary connector as providing 75 watts to an add-in card. This is a dated design purpose, not a tested rating for an unidentified cable.

Intel · ATX guide 2.01: six-position auxiliary power scope ↗

Locator: Document 336521, version 2.01, dated 1 February 2023; PCIe 2x3 subsection, 75-watt design purpose and sense-function prose.
Access: public page. Source-scoped identification only. No complete cable assembly, universal mating, pin assignment, safe operating load, installation instruction or independent approval is established.

S572: full source recordInspect review dependencies → (private workspace)

Claim scope: V139 Source-scoped identification only. No complete cable assembly, universal mating, pin assignment, safe operating load, installation instruction or independent approval is established.. Next review due 2027-01-10.

Back to first citation ↑
C191DSource checked · pending review

The PCIe 2x3 subsection of Intel guide 2.01 describes a sense connection used by the add-in card to detect an attached auxiliary-power connector; a wiring location or modification is not supplied here.

Intel · ATX guide 2.01: six-position auxiliary power scope ↗

Locator: Document 336521, version 2.01, dated 1 February 2023; PCIe 2x3 subsection, 75-watt design purpose and sense-function prose.
Access: public page. Source-scoped identification only. No complete cable assembly, universal mating, pin assignment, safe operating load, installation instruction or independent approval is established.

S572: full source recordInspect review dependencies → (private workspace)

Claim scope: V139 Source-scoped identification only. No complete cable assembly, universal mating, pin assignment, safe operating load, installation instruction or independent approval is established.. Next review due 2027-01-10.

Back to first citation ↑
C191ESource checked · pending review

CORSAIR describes using only the six-position portion of a 6+2 PCIe cable for a six-position connection; its small two-position portion is separate. This does not authorize an arbitrary cable or power-supply-side substitution.

CORSAIR · ATX motherboard role and separable PCIe cable portions ↗

Locator: 24-pin ATX connector and 6-pin / 6+2-pin PCIe sections. Text inspected; article images unavailable.
Access: public page. Source-scoped identification only. No complete cable assembly, universal mating, pin assignment, safe operating load, installation instruction or independent approval is established.

S570: full source recordInspect review dependencies → (private workspace)

Claim scope: V139 Source-scoped identification only. No complete cable assembly, universal mating, pin assignment, safe operating load, installation instruction or independent approval is established.. Next review due 2027-01-10.

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: Legacy PCIe auxiliary power versus 12VHPWR

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

MAIN & AUXILIARY POWER / SOURCE-QUALIFIED IDENTITY

Keep the component and application separate.

Auxiliary power is not total card power

Intel / document 336521, guide 2.01

Role
Dated add-in-card connector design context.
Distinction
2x3 auxiliary purpose: 75 W; the source also describes attachment sensing.
Established
This is neither a whole-card power budget nor a measured capability of an unknown cable.
Not established
The actual card, cable, PSU, current revision and operating conditions.
Next check
Use the exact device requirements; do not multiply position counts into a safe load.

Source-field reference; no physical view assigned to this row.

Evidence, component scope & limits

Observed . C191C · C191D

ATX guide 2.01: six-position auxiliary power scope ↗
Document 336521, version 2.01, dated 1 February 2023; PCIe 2x3 subsection, 75-watt design purpose and sense-function prose.
S572 · observation date 2026-10-12. Historical guide version 2.01 explicitly has a newer-version notice. Its 75 W purpose and sense role are retained as dated design-guide facts, not a safe load for an unknown cable. No table, wiring location or jumper procedure is reproduced.

The observation date is not a drawing revision. No wiring, fit or installation approval.

Read the six-position portion

CORSAIR / 6-pin and 6+2 cable explanation

Role
Equipment-side cable example.
Distinction
The guide describes the six-position portion separately from the small two-position portion.
Established
The split identifies a documented cable arrangement, not universal modular-side compatibility.
Not established
An exact cable part number or identity from a photograph alone.
Next check
Confirm PCIe cable role and the equipment manual; do not substitute an EPS cable.

Source-field reference; no physical view assigned to this row.

Evidence, component scope & limits

Observed . C191E

ATX motherboard role and separable PCIe cable portions ↗
24-pin ATX connector and 6-pin / 6+2-pin PCIe sections. Text inspected; article images unavailable.
S570 · observation date 2026-10-12. The guide identifies motherboard main power and describes using the six-position portion of a documented 6+2 cable. It does not identify every bare housing or authorize an unknown PSU cable.

The observation date is not a drawing revision. No wiring, fit or installation approval.

Read the complete power identity guide →

Evidence behind this page

Scope first. Source second. Approval separate.

3 linked sources · 4 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 3 source scopes, access limits and dates

S199 · ATX Version 3.0 — PCI Express add-in card connectors

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

Within inspection window

Scoped support: Identifies legacy 2x3 and 2x4 PCIe auxiliary-power forms and the 12VHPWR form with twelve larger power contacts plus four smaller sideband contacts.

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: PCIe auxiliary power connector section

S570 · ATX motherboard role and separable PCIe cable portions

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

Within inspection window

Scoped support: The guide identifies motherboard main power and describes using the six-position portion of a documented 6+2 cable. It does not identify every bare housing or authorize an unknown PSU cable.

Not established / limitations: Source-scoped identification only. No complete cable assembly, universal mating, pin assignment, safe operating load, installation instruction or independent approval is established.

Locator: 24-pin ATX connector and 6-pin / 6+2-pin PCIe sections. Text inspected; article images unavailable.

S572 · ATX guide 2.01: six-position auxiliary power scope

Intel · Manufacturer / product-owner domain · inspected 2026-10-12 · due 2027-01-10

Within inspection window

Scoped support: Historical guide version 2.01 explicitly has a newer-version notice. Its 75 W purpose and sense role are retained as dated design-guide facts, not a safe load for an unknown cable. No table, wiring location or jumper procedure is reproduced.

Not established / limitations: Source-scoped identification only. No complete cable assembly, universal mating, pin assignment, safe operating load, installation instruction or independent approval is established.

Locator: Document 336521, version 2.01, dated 1 February 2023; PCIe 2x3 subsection, 75-watt design purpose and sense-function prose.

Trace 4 claims to their source records

C191A · P191

Intel documents a 2x3 PCIe add-in-card auxiliary-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: S199 · Evidence trail → (private workspace)

C191C · P191

Intel design-guide version 2.01 describes the PCIe 2x3 auxiliary connector as providing 75 watts to an add-in card. This is a dated design purpose, not a tested rating for an unidentified cable.

Claim scope: V139 Source-scoped identification only. No complete cable assembly, universal mating, pin assignment, safe operating load, installation instruction or independent approval is established.

Source links: S572 · Evidence trail → (private workspace)

C191D · P191

The PCIe 2x3 subsection of Intel guide 2.01 describes a sense connection used by the add-in card to detect an attached auxiliary-power connector; a wiring location or modification is not supplied here.

Claim scope: V139 Source-scoped identification only. No complete cable assembly, universal mating, pin assignment, safe operating load, installation instruction or independent approval is established.

Source links: S572 · Evidence trail → (private workspace)

C191E · P191

CORSAIR describes using only the six-position portion of a 6+2 PCIe cable for a six-position connection; its small two-position portion is separate. This does not authorize an arbitrary cable or power-supply-side substitution.

Claim scope: V139 Source-scoped identification only. No complete cable assembly, universal mating, pin assignment, safe operating load, installation instruction or independent approval is established.

Source links: S570 · 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.