Computers, Laptops & Tablets > Accessories & Hardware 119 119 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 Facebook Twitter 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 VP and General Manager of Lifewire. lifewire's editorial guidelines Updated on August 18, 2021 Tweet Share Email Accessories & Hardware The Quick Guide to Webcams Keyboards & Mice Monitors Cards HDD & SSD Printers & Scanners Raspberry Pi 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. This power 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. 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. You can see other ATX power supply connector pinouts in our ATX Power Supply Pinout Tables list. 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 Was this page helpful? Thanks for letting us know! Get the Latest Tech News Delivered Every Day Email Address Sign up There was an error. Please try again. You're in! Thanks for signing up. There was an error. Please try again. Thank you for signing up! Tell us why! Other Not enough details Hard to understand Submit More from Lifewire SATA 15-Pin Power Connector Pinout ATX 4-pin 12V Power Connector Pinout ATX Power Supply Pinout Tables USB-C May Suck, but It’s Still Better Than Anything Else How to Manually Test a Power Supply With a Multimeter ATX 24-pin 12V Power Supply Pinout Floppy Drive 4-Pin Power Connector Pinout Power Supply Voltage Tolerances ATX 6-pin 12V Power Connector Pinout How to Install a Head Unit With No Wiring Harness How to Install a Second SSD How to Make an Internal Hard Drive External Computer Power Supply Parallel ATA (PATA) Motherboard Fan Connectors: What They Are and How They Work What Is a Lightning Connector?