Laserlab, Inc.

ATX Power Supply Connector Pinout

20 PIN MOLEX 39-29-9202 (at the motherboard)
20 PIN MOLEX 39-01-2200 (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 and +3.3V are OK)
9 5VSB   Purple +5 VDC Standby Voltage (max 10mA)
10 12V   Yellow +12 VDC
11 3.3V   Orange +3.3 VDC (two wires, one is sense.)
12 -12V   Blue -12 VDC
13 COM   Black Ground
14 /PS_ON   Green Power Supply On/Off (Active low. Short to COM to turn on supply.)
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

Source:
ATX Spec v2.03 at Platform Development Support


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