ATX Main Power
This page provides the connector style and pinout for the main power connector used on the ATX Motherboard.
The connector attached to the motherboard is a 20-pin dual-row Molex connector, or similar [Male pins].
The Molex part number is 39-29-9042, from the 5566 series. Also seen; 39-01-2200, and 39-29-9202.
The mating connector coming from the power supply cable is a Molex 39-01-2040 [Female sockets].
Refer to this
page for all other ATX header pinouts, or this page for the BTX motherboard header pinouts.
| Pin # | Signal Function | Cable | Pin # | Signal Function | Cable |
| 1 | +3.3VDC | Orange | 11 | +3.3VDC | Orange |
| 2 | +3.3VDC | Orange | 12 | -12VDC | Blue |
| 3 | COM | Black | 13 | COM | Black |
| 4 | +5VDC | Red | 14 | PS_ON# | Green |
| 5 | COM | Black | 15 | COM | Black |
| 6 | +5VDC | Red | 16 | COM | Black |
| 7 | COM | Black | 17 | COM | Black |
| 8 | PWR_OK | Gray | 18 | -5VDC | White |
| 9 | +5VSB | Purple | 19 | +5VDC | Red |
| 10 | +12VDC | Yellow | 20 | +5VDC | Red |
The pin out table above provides both the connector pinouts and wire colors for the cable assembly.
18 AWG wire is recommended for all wires but pin 11, which uses a 22 AWG wire.
16 AWG wires for 300 watt power supplies
These connectors and cables can be purchased from any computer store.
Just ask for a 20-pin Molex ATX main power cable assembly or 20-pin Molex connector.
Additional Mother Board form factors and processor types are listed on
the OEM MotherBoard Manufacturers
page.
Memory Module formats and manufacturers are listed on the Memory Module
Manufacturers page.
A few, but not many, computer manufacturers may use non-standard or proprietary components in their systems. The pinout for the power header listed on this page comply with the ATX specification. However some companies may use pinouts that differ from the pinout table above. First try to determine the pin out of the headers listed above from the manual that shipped with the computer, or review the ATX Motherboard specification then use these tables only after checking the manufacturing sources of data.
Electronic Key words: ATX, Board Standard, Interface Standard, Specification, Spec, Molex, Interface, Physical Interface, Description, Personal Computer Interface, PC, ATX Pinout, Main Power, Header, Pin out, Pins, Pin Assignment, Signal Name, Header, Motherboard Pinout, Mother Board.
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