ATX power supply pinout tables are useful references when testing a power supply. You need to know which pins correspond to ground or specific voltages before you can successfully test a PSU.

Each ATX power supply pinout table linked below conforms to Version 2.2 of the ATX Specification (PDF).

24 pin Motherboard Power Connector Pinout
ATX Main Power Connector Pinout Table
 ATX Main Power Connector Pinout Table. © Tim Fisher
The ATX 24 pin main power connector is the standard motherboard power connector used in nearly every computer.

ATX Main Power Connector Pinout Table (ATX v2.2)

This is the large 24 pin connector that usually attaches near the edge of the motherboard


15 pin SATA Power Connector Pinout
ATX Serial ATA Power Connector Pinout Table
 ATX Serial ATA Power Connector Pinout Table. © Tim Fisher
The SATA 15 pin power supply connector is one of several standard peripheral power connectors.

ATX Serial ATA Power Connector Pinout Table (ATX v2.2)

SATA power connectors only connect to SATA drives like hard drives and optical drives. SATA power connectors do not work with older PATA devices.


4 pin Peripheral Power Connector Pinout
ATX Peripheral Power Connector Pinout Table
 ATX Peripheral Power Connector Pinout Table. © Tim Fisher
The Molex 4 pin power supply connector is a standard peripheral power connector.

ATX Peripheral Power Connector Pinout Table (ATX v2.2)

Molex power connectors connect to many different kinds of internal peripherals including PATA hard drives and optical drives, some video cards, and even some other devices.


4 pin Floppy Drive Power Connector Pinout
ATX Floppy Drive Power Connector Pinout Table
 ATX Floppy Drive Power Connector Pinout Table. © Tim Fisher
The floppy drive 4 pin power supply connector is the standard floppy drive power connector.

ATX Floppy Drive Power Connector Pinout Table (ATX v2.2)

The floppy power connector, also called a Berg connector or Mini-Molex connector, is included in even the newest power supplies even though floppy drives are becoming obsolete

4 pin Motherboard Power Connector Pinout
ATX 4 Pin Power Connector Pinout Table
 ATX 4 Pin Power Connector Pinout Table. © Tim Fisher
The ATX 4 pin power supply connector is a standard motherboard power connector used to provide +12 VDC to the processor voltage regulator.

ATX 4 Pin Power Connector Pinout Table (ATX v2.2)

This small connector usually attaches to the motherboard near the CPU.

6 pin Motherboard Power Connector Pinout
ATX 6 Pin Power Connector Pinout Table
 ATX 6 Pin Power Connector Pinout Table. © Tim Fisher
The ATX 6 pin power supply connector is a motherboard power connector used to provide +12 VDC to the processor voltage regulator but the 4-pin variety is the more commonly used connector.

ATX 6 Pin Power Connector Pinout Table (ATX v2.2)

This small connector usually attaches to the motherboard near the CPU.