Computers, Laptops & Tablets Accessories & Hardware 26 26 people found this article helpful ATX 4 pin 12V Power Connector Pinout Pinout for the Standard ATX 4 pin (2x2) 12V Motherboard Power Connector by Tim Fisher General Manager, VP, Lifewire.com Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire. our editorial process Facebook Twitter LinkedIn Tim Fisher Updated on November 19, 2019 Accessories & Hardware The Quick Guide to Webcams Keyboards & Mice Monitors Cards HDD & SSD Printers & Scanners Raspberry Pi Tweet Share Email 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) 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.