Tom's Hardware: Topic 3v, 5v, 12v
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can anyone explain to me these 3v, 5v and 12v railing mean in a psu.
I've always thought the 12v is only in the 20-24 atx plug ans the 5-3v are in those 4 pin molex and floppy power, but after carefully looking at a case fan i found out those 4 pin molex can also support 12v? 
so what exactly is the 5v for? which line is which?
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