Psu rails

[david8115]

hello
I know that the 12b rail is for gfx, but what else it is used for?
correct me if i'm wrong, but is the 3.3v rail used for the cpu?

thanks

 

[theAnimal]

12V is for CPU as well.

 

[david8115]

thanks

 

[mamw93]

12v is for CPU, Hard Drives, Optical Drives, RAM, and Video Cards. 3.3/5v is for motherbaord, PCI cards and other PCI x1, x4, and x8 as long as there is no video card in it, and some fans.