Overclock.net banner

1 - 6 of 6 Posts

·
Registered
Joined
·
46 Posts
Discussion Starter #1
What goes on the 5v and 3v rails of a power supply(im guessing processor)?
And what would go on the 5vsb on this PSU
http://images17.newegg.com/is/image/newegg/17-139-006-S05?$S640W$

-Thanks
 

·
Premium Member
Joined
·
8,479 Posts
Quote:


Originally Posted by IdPlease
View Post

All HD's DVD drives, FANS etc use the +5v etc, as well as the Motherboard and CPU

Here is a good read to best understanding the PSU



You're half right. The motherboard and CPU use the 12V rails.
 

·
Premium Member
Joined
·
16,520 Posts
The motherboard uses all of the voltages to at least some extent, but yes the CPU and mobo primarily use +12V. +5V powers the hard drive motors and some other things.
 

·
The Fabricat0r
Joined
·
5,933 Posts
You are all kind of right.

3.3V is pretty much only used for DRAM. That includes powering the RAM slots on the mobo and the RAM on your video card. SATA HDDs are also designed to use 3.3V on their logic boards but that has pretty much been abandoned.

5V powers most circuitry. That would include the logic boards on HDDs and optical drives and various chips on the mobo. USB is also powered from the 5V rail.

The 12V rail is for anything power hungry and all motors. That would be the CPU, the core on your video card, fans and HDD/optical motors. It may also power some various bits on the mobo but that will vary with manufacturer and design.
 
1 - 6 of 6 Posts
Top