# ATX Power Supply

(at the motherboard)
(at the cable)

20 PIN MOLEX 39-29-9202 at the motherboard
20 PIN MOLEX 39-01-2200 at the cable

Pin | Name |  | Color | Description
--- | --- | --- | --- | ---
1 | 3.3V |  | Orange | +3.3 VDC
2 | 3.3V |  | Orange | +3.3 VDC
3 | COM |  | Black | Ground
4 | 5V |  | Red | +5 VDC
5 | COM |  | Black | Ground
6 | 5V |  | Red | +5 VDC
7 | COM |  | Black | Ground
8 | PWR_OK |  | Gray | Power Ok (+5V & +3.3V is ok)
9 | 5VSB |  | Purple | +5 VDC Standby Voltage (max 10mA)
10 | 12V |  | Yellow | +12 VDC
11 | 3.3V |  | Orange | +3.3 VDC
12 | -12V |  | Blue | -12 VDC
13 | COM |  | Black | Ground
14 | /PS_ON |  | Green | Power Supply On (active low)
15 | COM |  | Black | Ground
16 | COM |  | Black | Ground
17 | COM |  | Black | Ground
18 | -5V |  | White | -5 VDC
19 | 5V |  | Red | +5 VDC
20 | 5V |  | Red | +5 VDC

18 AWG is recommended for all wires except pin 11, which should be 22 AWG
For 300W configurations 16 AWG is recommended.

Contributor: Joakim Ögren

Source:
ATX Spec v2.03 at Platform Development Support

Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2001-06-08