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 pinout table linked below (in the headings of each section) conforms to Version 2.2 of the ATX Specification (PDF).
24-pin Motherboard Power Connector Pinout
The ATX 24 pin main power connector is the standard motherboard power connector used in nearly every computer.
This is the large 24-pin connector that usually attaches near the edge of the motherboard.
15-pin SATA Power Connector Pinout
The SATA 15-pin power supply connector is one of several standard peripheral power connectors.
SATA power connectors only connect to SATA drives like hard drives and optical drives. They don’t work with older PATA devices.
4-pin Peripheral Power Connector Pinout
The Molex 4-pin power supply connector is a standard peripheral power connector.
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
The floppy drive 4-pin power supply connector is the standard floppy drive power connector.
Also called a Berg connector or Mini-Molex connector, it’s included in even the newest power supplies even though floppy drives are becoming obsolete.
4 pin Motherboard Power Connector Pinout
The ATX 4-pin power supply connector is a standard motherboard power connector used to provide +12 VDC to the processor voltage regulator.
This small connector usually attaches to the motherboard near the CPU.
6-pin Motherboard Power Connector Pinout
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.
This connector usually attaches to the motherboard near the CPU.
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