Get wired!  

pinout (распиновка)

ATX +12V Power Supply

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4 pin MOLEX 39-29-9042 connector  at the motherboard
Pin Name   Color Description
1 COM   Black Ground
2 COM   Black Ground
3 +12VDC   Yellow +12 VDC
4 +12VDC   Yellow +12 VDC

4 pin MOLEX 39-01-2040 connector  at the cable

Recommended wiresize 20 AWG

Источник: ATX Spec v2.03 at Platform Development Support