Abit AN8 SLI User Manual page 23

Hardware Setup
AN8 SLI
Note: It is recommended to connect to a power with 350W, 20A +5VDC capacity at least for heavily
loaded system, and a 2A +5VSB capacity at least for supporting wake-up features.
The auxiliary 12V power connector [ATX4P1] provides an additional
power source for devices added on PCI Express slots. It is highly
recommended to attach 12V power from the power supplier for the best
system stability.
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User's Manual