ATX 4 pin 12V Power Connector Pinout

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

Picture of an ATX 4 pin 12V Power Connector Pinout
© Smial (talk) / Wikimedia Commons
by Tim Fisher
Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire.
Updated July 12, 2017

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)

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).

Note: 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.

PinNameColorDescription
1COMBlackGround
2COMBlackGround
3+12VDCYellow+12 VDC
4+12VDCYellow+12 VDC

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.

More Information on the ATX 4 pin 12V Power Connector