Computers, Laptops & Tablets > Accessories & Hardware 150 150 people found this article helpful Molex 4-pin Peripheral Power Connector Pinout Pinout for the standard 4-Pin Molex peripheral power connector By Tim Fisher Tim Fisher Senior Vice President & Group General Manager, Tech & Sustainability Emporia State University Tim Fisher has more than 30 years' of professional technology experience. He's been writing about tech for more than two decades and serves as the SVP and General Manager of Lifewire. lifewire's editorial guidelines Updated on July 31, 2023 Accessories & Hardware The Quick Guide to Webcams Keyboards & Mice Monitors Cards HDD & SSD Printers & Scanners Raspberry Pi Trending Videos Close this video player The Molex 4-pin power supply connector is one of the standard peripheral power connectors in computers today. The power connector itself is a Molex 8981 connector called the AMP MATE-N-LOK. Below is the pinout for the standard Molex 4-pin peripheral power connector as of Version 2.2 of the ATX Specification (PDF). Wikimedia Commons If you're using this pinout table to test power supply voltages, be aware that the voltages must be within ATX specified tolerances. Here are other ATX power supply connector pinouts Molex 4-pin Peripheral Power Connector Pinout (ATX v2.2) Pinout Table for Molex 4-pin Power Connectors Pin Name Color Description 1 +12VDC Yellow +12 VDC 2 COM Black Ground 3 COM Black Ground 4 +5VDC Red +5 VDC 1:20 How to Test a Molex 4-Pin Peripheral With a Multimeter What Is a Molex Connector? Molex connectors provide power to the various parts of a computer, such as the motherboard, fans, floppy drive and disc drive, and more. The Molex 4-pin power supply connector is the standard connector for all PATA based hard drives, many high-end video cards, and some older optical drives and other internal devices. Was this page helpful? Thanks for letting us know! Get the Latest Tech News Delivered Every Day Subscribe Tell us why! Other Not enough details Hard to understand Submit Newsletter Sign Up Newsletter Sign Up Newsletter Sign Up Newsletter Sign Up By clicking “Accept All Cookies”, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. Cookies Settings Accept All Cookies