Get wired - Pinout and description of ATX Aux Power Supply connector.

ATX Aux Power Supply connector


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To be used for motherboards requiring 250W or 300W

6 pin MOLEX 90331-0010 connector
Pin Name   Color Description
1 COM   Black Ground
2 COM   Black Ground
3 COM   Black Ground
4 3.3V   Orange +3.3 VDC
5 3.3V   Orange +3.3 VDC
6 5V   Red +5 VDC

Recommended wiresize 16 AWG

Source: ATX Spec v2.03 at Platform Development Support