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).

You can see other ATX power supply connector pinouts in our ATX Power Supply Pinout Tables list.

If you’re using this pinout table to test power supply voltages, be aware that the voltages must be within ATX specified tolerances.

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.

How to Test the Power Supply in a Computer

Get the Latest Tech News Delivered Every Day

  • ATX Power Supply Pinout Tables

  • How to Manually Test a Power Supply With a Multimeter

  • ATX 24-pin 12V Power Supply Pinout

  • SATA 15-Pin Power Connector Pinout

  • Molex 4-pin Peripheral Power Connector Pinout

  • How to Use a Power Supply Tester to Test a PSU

  • Floppy Drive 4-Pin Power Connector Pinout

  • ATX 6-pin 12V Power Connector Pinout

  • Power Supply Voltage Tolerances

  • Parallel ATA (PATA)

  • USB Physical Compatibility Chart

  • How to Install a Desktop Power Supply

  • Computer Power Supply

  • How to Reseat Internal Data and Power Cables

  • Motherboard Fan Connectors: What They Are and How They Work

  • USB (Universal Serial Bus): Everything You Need to Know

  • Facebook

  • Twitter

Hit Refresh on Your Tech News

  • About Us

  • Privacy Policy

  • Editorial Guidelines

  • Terms of Use

  • Careers

  • Advertise

  • Contact

  • EU Privacy

  • NEWS

  • HOW TO

  • FEATURES

  • ABOUT US