ATX 4 pin 12V Power Connector Pinout

Pinout for the Standard ATX 4 pin (2x2) 12V Motherboard Power Connector

by Tim Fisher
Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire.
Updated November 19, 2019

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 12V Power Connector Pinout (ATX v2.2)

Picture of an ATX 4 pin 12V Power Connector Pinout
Wikimedia Commons 

Below is the complete pinout table for the standard ATX 4 pin (2x2) 12V power connector as of Version 2.2 of the ATX Specification (PDF).

If you're using this pinout table to test power supply voltages, be aware that the voltages must be within ATX specified tolerances.

You can see other ATX power supply connector pinouts in my ATX Power Supply Pinout Tables list.

Pinout Reference for ATX 4 pin 12V Power Connectors
Pin Name Color Description
1 COM Black Ground
2 COM Black Ground
3 +12VDC Yellow +12 VDC
4 +12VDC Yellow +12 VDC
2:23

How to Test the Power Supply in a Computer

The plug (male) is a Molex 39-01-2040 connector, the vertical receptacle (female) is a Molex 39-28-1043, and the right-angle receptacle is a Molex 39-29-1048.