On an ATX motherboard, the 4-pin auxiliary power connector provides which of the following?

A.
Additional power to onboard devices

B.
Additional power to PCIx peripheral cards

C.
Additional power to the South Bridge

D.
Additional power to the CPU voltage regulator

Explanation:

http://pcsupport.about.com/od/insidethepc/a/atx-pinout-4-pin-12v-psu.htm