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ATX 4 pin 12V Power Connector Pinout

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

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4 Pin Motherboard Power Connector - Molex 39-01-2040

4 Pin Motherboard Power Connector

© 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.

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.

ATX 4 pin 12V Power Connector Pinout (ATX v2.2)

Pin Name Color Description
1 COM Black Ground
2 COM Black Ground
3 +12VDC Yellow +12 VDC
4 +12VDC Yellow +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.

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