E338 · Source-scoped pinout variants

4-pin PWM PC fan connector / motherboard header engineering reference

Named wiring from the pinout research; connector shape alone does not establish capabilities.

Open field note Source trail

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

4-pin PWM PC fan engineering reference original orientation schematic — Original pinout diagram; read the exact variant and view below. Not to scale.

Contact count

Not asserted

Source-scoped connector interface

Mating boundary

Shape is not the verdict.

Check the exact device and mating connector.

Orientation

How to read this profile

Read the exact variant view convention. Schematic layouts do not establish physical positions.

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
Positions / cavity span	4 (Molex 470531000 (47053-1000))S854Source-scoped examples are separate; select the exact variant and measured axis. Molex 470531000 (47053-1000). Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Populated contacts	4 (Molex 470531000 (47053-1000))S854Source-scoped examples are separate; select the exact variant and measured axis. Molex 470531000 (47053-1000). Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Contact rows	1 (Molex 470531000 (47053-1000))S854Source-scoped examples are separate; select the exact variant and measured axis. Molex 470531000 (47053-1000). Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Contact pitch	2.54 mm Contact mating centerline pitch (Molex 470531000 (47053-1000))S854Source-scoped examples are separate; select the exact variant and measured axis. Molex 470531000 (47053-1000). Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Dimensions / axis	3.5 mm PC tail length (Molex 470531000 (47053-1000))S854Source-scoped examples are separate; select the exact variant and measured axis. Molex 470531000 (47053-1000). Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Connector role	Vertical male PCB header (Molex 470531000 (47053-1000))S854Source-scoped examples are separate; select the exact variant and measured axis. Molex 470531000 (47053-1000). Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Contact gender / arrangement	male (Molex 470531000 (47053-1000))S854Source-scoped examples are separate; select the exact variant and measured axis. Molex 470531000 (47053-1000). Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Mounting	cable (Claim C344C); board (Claim C344C); through-hole (Molex 470531000 (47053-1000))S592 · S854Source-scoped examples are separate; select the exact variant and measured axis. V142: named MSI B550-A PRO manual version 6.0 (2024/02) or explicitly identified Noctua family only. Role/recognition evidence, not generic wiring, safe mating, pinout approval, dimensions or installed-device certification. Molex 470531000 (47053-1000). Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Coupling / latch	Lock to mating part: yes (Molex 470531000 (47053-1000))S854Source-scoped examples are separate; select the exact variant and measured axis. Molex 470531000 (47053-1000). Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Keying / polarization	Polarized to mating part: yes; keyed to mating part: no (Molex 470531000 (47053-1000))S854Source-scoped examples are separate; select the exact variant and measured axis. Molex 470531000 (47053-1000). Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Shell / form	unshrouded (Molex 470531000 (47053-1000))S854Source-scoped examples are separate; select the exact variant and measured axis. Molex 470531000 (47053-1000). Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Manufacturer	Molex (Molex 470531000 (47053-1000))S854Source-scoped examples are separate; select the exact variant and measured axis. Molex 470531000 (47053-1000). Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.
Exact part / implementation	470531000 (Molex 470531000 (47053-1000))S854Source-scoped examples are separate; select the exact variant and measured axis. Molex 470531000 (47053-1000). Named primary-source example only. Identification facts do not certify mating, electrical compatibility, fabrication or powered use.

Not recorded: Nominal contacts, Series, Recorded markings, View convention. Unknown fields stay unknown; illustrations supply no measurements or pin assignments.

Recorded variant and source limits

Check the exact device manual before wiring or applying power.
MSI MAG B550 TOMAHAWK fan header in PWM mode: Header numbering per manual.
MSI MAG B550 TOMAHAWK fan header in DC mode (same header, BIOS-selected): Header numbering per manual.
GIGABYTE B550 AORUS ELITE (AX) CPU_FAN/SYS_FAN/CPU_OPT headers: Header numbering per manual.
MSI B550-A PRO fan headers, PWM mode: MSI p.38 board-header sketches as printed: pin 1 is leftmost in the horizontal sketch. Check selected BIOS mode. Cable rear orientation is not established.
MSI B550-A PRO four-position headers, DC mode: MSI p.38 board-header sketches as printed: pin 1 is leftmost in the horizontal sketch. Check selected BIOS mode. Cable rear orientation is not established.
Noctua NF-A8 PWM, 12 V: Product specification numbers the fan-cable contacts; white paper identifies a female cable and shows wire colors. A numeric mating-face versus rear-view drawing is not established.

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 variantMSI MAG B550 TOMAHAWK fan header in PWM mode

MSI MAG B550 TOMAHAWK fan header in PWM mode

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

View and evidence limits

Header numbering per manual.

P344 4-pin fan — **Agree** for comparable PWM and DC modes — Different MSI board manuals agree: PWM = ground/+12 V/sense/control; DC = ground/voltage control/sense/NC. A adds GIGABYTE; B adds the Noctua PWM white paper and NF-A8 PWM specification. B supplies fan-side manufacturer evidence that A lacked; the Intel fan standard itself remains unavailable.
The Intel specification (fan-side electrical requirements, PWM frequency, tach pulses) was not obtained from an Intel host; fan-side pinout is not verified from the standard. Only motherboard-header variants are verified.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

MSI MAG B550 TOMAHAWK fan header in PWM mode — source-scoped contact map
Pin	Signal	What it does	Status
1	Ground	Ground reference and return.	Device-specific Sources
2	+12V	Power connection (+12V). Check the specified supply.	Device-specific Sources
3	Sense	Control, detection or configuration connection; check the source and device.	Device-specific Sources
4	Speed Control Signal	Control, detection or configuration connection; check the source and device.	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_FAN1, PUMP_FAN1, SYS_FAN1~6: Fan Connectors', PWM Mode and DC Mode pin definition tables, printed p. 23

MSI MAG B550 TOMAHAWK fan header in DC mode (same header, BIOS-selected)

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

View and evidence limits

Header numbering per manual.

P344 4-pin fan — **Agree** for comparable PWM and DC modes — Different MSI board manuals agree: PWM = ground/+12 V/sense/control; DC = ground/voltage control/sense/NC. A adds GIGABYTE; B adds the Noctua PWM white paper and NF-A8 PWM specification. B supplies fan-side manufacturer evidence that A lacked; the Intel fan standard itself remains unavailable.
Mode is selectable in BIOS; CPU_FAN1 defaults to Auto, PUMP_FAN1 to PWM, SYS_FAN1~6 to DC.
The Intel specification (fan-side electrical requirements, PWM frequency, tach pulses) was not obtained from an Intel host; fan-side pinout is not verified from the standard. Only motherboard-header variants are verified.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

MSI MAG B550 TOMAHAWK fan header in DC mode (same header, BIOS-selected) — source-scoped contact map
Pin	Signal	What it does	Status
1	Ground	Ground reference and return.	Device-specific Sources
2	Voltage Control	Control, detection or configuration connection; check the source and device.	Device-specific Sources
3	Sense	Control, detection or configuration connection; check the source and device.	Device-specific Sources
4	NC	Not connected or absent in this named wiring.	Not connected 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_FAN1, PUMP_FAN1, SYS_FAN1~6: Fan Connectors', PWM Mode and DC Mode pin definition tables, printed p. 23

GIGABYTE B550 AORUS ELITE (AX) CPU_FAN/SYS_FAN/CPU_OPT headers

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

View and evidence limits

Header numbering per manual.

P344 4-pin fan — **Agree** for comparable PWM and DC modes — Different MSI board manuals agree: PWM = ground/+12 V/sense/control; DC = ground/voltage control/sense/NC. A adds GIGABYTE; B adds the Noctua PWM white paper and NF-A8 PWM specification. B supplies fan-side manufacturer evidence that A lacked; the Intel fan standard itself remains unavailable.
The Intel specification (fan-side electrical requirements, PWM frequency, tach pulses) was not obtained from an Intel host; fan-side pinout is not verified from the standard. Only motherboard-header variants are verified.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

GIGABYTE B550 AORUS ELITE (AX) CPU_FAN/SYS_FAN/CPU_OPT headers — source-scoped contact map
Pin	Signal	What it does	Status
1	GND	Ground reference and return.	Device-specific Sources
2	Voltage Speed Control	Control, detection or configuration connection; check the source and device.	Device-specific Sources
3	Sense	Control, detection or configuration connection; check the source and device.	Device-specific Sources
4	PWM Speed Control	Control, detection or configuration connection; check the source and device.	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 3/4) CPU_FAN/SYS_FAN1/2/3 (Fan Headers) pin table, printed p. 15; item 5) CPU_OPT, printed p. 16

MSI B550-A PRO fan headers, PWM mode

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

View and evidence limits

MSI p.38 board-header sketches as printed: pin 1 is leftmost in the horizontal sketch. Check selected BIOS mode. Cable rear orientation is not established.

P344 4-pin fan — **Agree** for comparable PWM and DC modes — Different MSI board manuals agree: PWM = ground/+12 V/sense/control; DC = ground/voltage control/sense/NC. A adds GIGABYTE; B adds the Noctua PWM white paper and NF-A8 PWM specification. B supplies fan-side manufacturer evidence that A lacked; the Intel fan standard itself remains unavailable.
Defaults: CPU_FAN1 Auto, PUMP_FAN1 PWM, SYS_FAN1–6 DC.
A four-pin shell does not identify voltage. Unexamined 5 V/24 V models, proprietary headers and cable-rear numbering remain unverified.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

MSI B550-A PRO fan headers, PWM mode — source-scoped contact map
Pin	Signal	What it does	Status
1	Ground	Ground reference and return.	Device-specific Sources
2	+12V	Power connection (+12V). Check the specified supply.	Device-specific Sources
3	Sense	Control, detection or configuration connection; check the source and device.	Device-specific Sources
4	Speed Control Signal	Control, detection or configuration connection; check the source and device.	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.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

MSI B550-A PRO four-position headers, DC mode

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

View and evidence limits

MSI p.38 board-header sketches as printed: pin 1 is leftmost in the horizontal sketch. Check selected BIOS mode. Cable rear orientation is not established.

P344 4-pin fan — **Agree** for comparable PWM and DC modes — Different MSI board manuals agree: PWM = ground/+12 V/sense/control; DC = ground/voltage control/sense/NC. A adds GIGABYTE; B adds the Noctua PWM white paper and NF-A8 PWM specification. B supplies fan-side manufacturer evidence that A lacked; the Intel fan standard itself remains unavailable.
A four-pin shell does not identify voltage. Unexamined 5 V/24 V models, proprietary headers and cable-rear numbering remain unverified.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

MSI B550-A PRO four-position headers, DC mode — source-scoped contact map
Pin	Signal	What it does	Status
1	Ground	Ground reference and return.	Device-specific Sources
2	Voltage Control	Control, detection or configuration connection; check the source and device.	Device-specific Sources
3	Sense	Control, detection or configuration connection; check the source and device.	Device-specific Sources
4	NC	Not connected or absent in this named wiring.	Not connected 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.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

Noctua NF-A8 PWM, 12 V

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

View and evidence limits

Product specification numbers the fan-cable contacts; white paper identifies a female cable and shows wire colors. A numeric mating-face versus rear-view drawing is not established.

P344 4-pin fan — **Agree** for comparable PWM and DC modes — Different MSI board manuals agree: PWM = ground/+12 V/sense/control; DC = ground/voltage control/sense/NC. A adds GIGABYTE; B adds the Noctua PWM white paper and NF-A8 PWM specification. B supplies fan-side manufacturer evidence that A lacked; the Intel fan standard itself remains unavailable.
White paper also covers 5 V and 24 V fans, but this numbered variant is the named 12 V NF-A8 PWM only.
A four-pin shell does not identify voltage. Unexamined 5 V/24 V models, proprietary headers and cable-rear numbering remain unverified.

Schematic only · physical contact positions unconfirmed. Original drawing · not to scale. Scroll sideways if needed.

Noctua NF-A8 PWM, 12 V — source-scoped contact map
Pin	Signal	What it does	Status
1	Ground (GND), black	Ground reference and return.	Device-specific Sources
2	Voltage (Vcc), yellow	Power connection (Voltage (Vcc), yellow). Check the specified supply.	Device-specific Sources
3	RPM Signal, green	Wire colour for this termination: RPM Signal, green.	Device-specific Sources
4	PWM Signal, blue	Wire colour for this termination: PWM Signal, blue.	Device-specific Sources

Sources (2)

S837 · Noctua · NF-A8 PWM — Specifications
Undated live manufacturer specification page; accessed 2026-10-21 · Specifications > Extended specifications > Electrical specifications, Rated voltage and Pin configuration rows; Mechanical specifications > Connector type
S838 · Noctua · Noctua PWM specifications white paper
No printed revision/date; PDF metadata creation 2023-12-21 · PDF p.2, Connectors and cables; PDF p.3, Pin configuration (12 V illustration) and Tachometer output signal; PDF p.6, PWM control input signal

Unknowns stay unknown.

Check the exact device manual before wiring or applying power.

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

C810Gsource checked

MSI MAG B550 TOMAHAWK fan header in PWM mode: 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.

C810Hsource checked

MSI MAG B550 TOMAHAWK fan header in DC mode (same header, BIOS-selected): original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

C810Isource checked

GIGABYTE B550 AORUS ELITE (AX) CPU_FAN/SYS_FAN/CPU_OPT headers: 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.

C810Jsource checked

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

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.

C810Ksource checked

MSI B550-A PRO four-position headers, DC mode: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

C810Lsource checked

Noctua NF-A8 PWM, 12 V: original contact normalization. Statuses distinguish comparison agreement, source limits and named-device wiring.

Noctua · NF-A8 PWM — Specifications ↗
Specifications > Extended specifications > Electrical specifications, Rated voltage and Pin configuration rows; Mechanical specifications > Connector type · Source scope and unresolved evidence are preserved in the engineering variant.

Noctua · Noctua PWM specifications white paper ↗
PDF p.2, Connectors and cables; PDF p.3, Pin configuration (12 V illustration) and Tachometer output signal; PDF p.6, PWM control input signal · Source scope and unresolved evidence are preserved in the engineering variant.

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

Evidence behind this page

Scope first. Source second. Approval separate.

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

Page scope: Original schematic; not to scale and not fabrication approval.

Assessment 2026-10-22 · earliest scheduled source review 2027-01-18. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 5 source scopes, access limits and dates

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

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

S837 · NF-A8 PWM — Specifications

Noctua · 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: Specifications > Extended specifications > Electrical specifications, Rated voltage and Pin configuration rows; Mechanical specifications > Connector type

S838 · Noctua PWM specifications white paper

Noctua · 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: PDF p.2, Connectors and cables; PDF p.3, Pin configuration (12 V illustration) and Tachometer output signal; PDF p.6, PWM control input signal

Trace 6 claims to their source records

C810G · P344

MSI MAG B550 TOMAHAWK fan header in PWM mode: 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)

C810H · P344

MSI MAG B550 TOMAHAWK fan header in DC mode (same header, BIOS-selected): 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)

C810I · P344

GIGABYTE B550 AORUS ELITE (AX) CPU_FAN/SYS_FAN/CPU_OPT headers: 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)

C810J · P344

MSI B550-A PRO fan headers, PWM mode: 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)

C810K · P344

MSI B550-A PRO four-position headers, DC mode: 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)

C810L · P344

Noctua NF-A8 PWM, 12 V: 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: S837 · S838 · 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.