Get wired - Pinout and description of ATX Optional Power connector.

ATX Optional Power connector


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6 pin MOLEX 39-30-1060 connector  at the motherboard
Pin Name     Color Description
1 FanM     White Fan Monitor
2 FanC     White/Blue Fan Control
3 3.3V Sense     White/Brown 3.3V Sense Line
4 1394R     White/Black IEEE-1394 Ground
5 1394V     White/Red IEEE-1394 Voltage?
6 Reserved     n/a  

6 pin MOLEX 39-01-2060 connector  at the cable

Source: ATX Spec v2.03 at Platform Development Support