Citation :
12v = cpu
5v = vdimm, vdd, periphials (hard drives, fans, cdroms etc)
3.3v = AGP as far as I know, but please dont quote me on this as I truly do not know what the 3.3v powers now.
5v has massive amps usually because of the high number of devices it has to power. If you have 2x SATA in raid, 2 cdroms, 8 fans, etc, you need a lot of 5v juice for them all
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