Can I plug a PSU SATA power cable directly into a motherboard header?

No! PSU SATA/PATA modular cables carry raw DC voltages (+12V, +5V, +3.3V) meant exclusively for SATA storage drives (SSDs/HDDs), fan hubs, and AIO liquid cooler pumps. Motherboards connect to SATA drives using a separate 7-pin SATA Data Cable. Plugging PSU SATA power into motherboard front-panel USB or data headers will short out board circuits.

What is the 35mm bend radius safety rule for 12V-2x6 / 12VHPWR cables?

PCIe 5.1 / ATX 3.1 12V-2x6 cables can carry up to 600W. If the cable is bent sharply near the terminal terminals, uneven contact resistance on the outer pins causes localized thermal hotspots. Always maintain at least 35mm (1.4 inches) of straight, unbent cable from the connector face before routing.

What is the difference between an 8-Pin CPU EPS cable and an 8-Pin PCIe cable?

Although both are 8-pin connectors, they have completely different pinouts and keying. An EPS12V CPU connector supplies +12V on 4 pins and Ground on 4 pins. A PCIe 8-pin connector supplies +12V on 3 pins and Ground on 5 pins. Forcing an EPS cable into a PCIe GPU port or vice versa causes an immediate short.

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SYNAPSE HARDWARE TOOLS•PSU & Motherboard Pinout Matrix

Interactive PSU Wiring Visualizer & Motherboard Pinout Guide

Master your PC cable management and prevent electrical hazards. Interactively trace modular power supply ports to motherboard headers, PCIe 12V-2x6 GPU connectors, PWM fans, and SATA storage with millimeter pinout precision and latch orientation checks.

24-Pin ATX & 8-Pin EPS 12V-2x6 600W PCIe 5.1 35mm Bend Safety Rules Physical Hardware Photo Overlay

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Interactive Modular PSU Cable Tracing & Motherboard Pinouts

Select any cable category or click a modular PSU port below to illuminate the exact cable route, pinout latch orientation, and target header.

Pinout Matrix

24-Pin ATX Main Motherboard Power Cable

+12V, +5V, +3.3V, +5VSB, -12V

Corsair Type 4 split 18+10 pin modular cable combining into the standard 24-pin ATX motherboard header. Powers CPU VRMs auxiliary logic, chipset, PCIe slot rails, and memory.

Mechanical Latches

PSU Side:TOP Latch

Target Side:RIGHT Latch

Rating:375W Continuous

Pinout Terminal Mapping (24 Terminals)Corsair Type 4 Pinout Standard

1:+3.3V

2:+3.3V

3:GND

4:+5V

5:GND

6:+5V

7:GND

8:PWR_OK

9:+5VSB

10:+12V1

11:+12V1

12:+3.3V

13:+3.3V

14:-12V

15:GND

16:PS_ON#

17:GND

18:GND

19:GND

20:NC

21:+5V

22:+5V

23:+5V

24:GND

Critical Safety & Bend Warnings

12V-2x6 / 12VHPWR 35mm Rule

Always maintain ≥35mm of straight cable lead from the GPU connector before introducing any horizontal or vertical bend.

Audible Click Engagement

Never leave a gap between cable housing and receptacle. Listen for the physical snap of the retention latch.

Never Mix Modular Cables

Corsair Type 4 pinouts differ from Seasonic/EVGA! Using cables from other brands can send +12V into ground pins and destroy hardware.

PSU SATA Never Plugs into Motherboards

PSU SATA/PATA cables route directly to 2.5" SSDs, 3.5" HDDs, and AIO cooler hubs. Motherboard SATA ports are data only (7-pin) and carry 0V electrical power.

Key Modular Connectors & Pinout Standards

Overview of the 4 primary power cable families found in modern ATX 3.1 & EPS12V architectures.

24-Pin ATX MainMotherboard Power

Powers motherboard chipset, PCIe slot power (up to 75W), RAM slots, and front panel logic. Splits into an 18-pin + 10-pin interface on the modular PSU backplane.

Voltages: +3.3V, +5V, +12V, -12V, +5VSB

Control Pins: PS_ON#, PWR_OK

8-Pin (4+4) EPS12VCPU VRM Power

Dedicated +12V rail delivering clean current directly to the CPU voltage regulator modules (VRM). Keyed strictly with square and beveled pins to prevent improper insertion.

Current Rating: Up to 336W per 8-pin

Pinout: 4x +12V (bottom) + 4x Ground (top)

12V-2x6 PCIe 5.1Up to 600W GPU

Next-generation high-density power connector with 12 main 12V power pins and 4 recessed micro-sense pins (S1-S4) to guarantee full connector latch seating before power delivery.

Sense Pins: S1-S4 sideband signals

Safety Rule: 35mm straight clearance

6-Pin SATA / PATAPeripherals & Hubs

Supplies power to SATA 2.5" SSDs, 3.5" Hard Drives, AIO pump heads, and ARGB fan controller hubs. Never routes directly into the motherboard.

Destination: Storage & Pump Hubs

Warning: No direct motherboard plug

Safety Rules: 12V-2x6 Sense Pins, Bend Radius & SATA Power Routing

Avoid common builder oversights that lead to melted connectors, component shorts, or system shutoffs.

Critical Rule #1

PSU SATA Power NEVER Plugs into Motherboards

A 6-pin modular cable coming from the PSU's "SATA / PATA" port must ONLY connect to SATA storage drives, AIO cooler pump power, or fan controller hubs. Motherboards receive data through thin 7-pin SATA Data Cables. Plugging PSU SATA power directly into motherboard USB or front-panel pinouts creates an immediate short circuit.

Critical Rule #2

35mm Minimum Straight Cable Clearance on 12V-2x6

When connecting your graphics card (e.g. GeForce RTX 4080, 4090, 5080, 5090), do not bend the 12V-2x6 / 12VHPWR cable within 35mm (1.4 inches) of the connector housing. Pre-mature bending loosens the outer terminal pins, creates electrical resistance, and risks heat-related terminal melting.

Critical Rule #3

Audible Latch Click & Zero Connector Gap

Both on the modular power supply backplane and on the motherboard/GPU side, verify that the retention latch clicks firmly into place with zero visible gap between the male and female connector shrouds. Inspect with a flashlight from both top and sides before first power-on.

Front Panel Headers, PWM Fans, AIO Pumps & ARGB Pinouts

Clear mapping of small-signal headers pre-wired from your PC chassis and cooling accessories.

4-Pin PWM Fan & AIO Pump Headers

Modern motherboards feature 4-pin headers with Ground, +12V DC, TACH (RPM readout), and PWM duty-cycle modulation. The CPU_FAN header controls CPU cooler speeds based on core thermals. The AIO_PUMP header defaults to 100% full-speed duty cycle to prevent pump stalls.

Chassis Front Panel Header (JFP1)

Located on the bottom-right corner of the motherboard. Contains pins for POWER SW, RESET SW, POWER LED (+/-), and HDD LED (+/-). Switches are non-polar momentary contacts, while LEDs must observe +/- polarity.

3-Pin 5V ARGB vs 4-Pin 12V RGB

3-Pin ARGB (+5V, Data, GND) features a blocked center pin key. It provides addressable, flowing lighting effects. Do not force onto 4-pin 12V headers. Legacy 4-pin RGB operates at 12V and will permanently burn out 5V ARGB LEDs.

Front Panel USB 3.2 Gen 1 & USB-C Gen 2x2

Front-panel USB 3.0 uses a 19-pin keyed shrouded connector (pins are fragile; align the notch carefully before pressing). USB-C front-panel utilizes a modern compact Key-A 20-pin internal header with symmetrical retention clips.

Frequently Asked Questions (PSU & Motherboard Wiring)

Answers to common questions regarding power supply connections and pinout safety.

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Interactive PSU Wiring Visualizer & Motherboard Pinout Guide

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