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What does the different PSU rails?

post #1 of 6
Thread Starter 
The topic says it all.

I would like to know what the 3V, 5,5V, 12V and 5VSB do.
Most corious about the 3V, 5,5V and 5VSB smile.gif I know what the 12V does wink.gif

Thanks it advance smile.gif
    
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post #2 of 6
+12V powers the CPU, graphics card, and hard drive motors. It delivers ~90% of system power.

+5V powers motherboard chipsets, SSDs, hard drive circuitry, USB and a few other functions.

+3.3V powers RAM and low-power SSDs

+5VSB powers USB ports when the computer is turned off and powers the motherboard start-up circuitry

-12V is used for RS232
post #3 of 6
Quote:
Originally Posted by CM Phaedrus View Post

+12V powers the CPU, graphics card, and hard drive motors. It delivers ~90% of system power.

+5V powers motherboard chipsets, SSDs, hard drive circuitry, USB and a few other functions.

+3.3V powers RAM and low-power SSDs

+5VSB powers USB ports when the computer is turned off and powers the motherboard start-up circuitry

-12V is used for RS232


Do you thinking -12V will make it through the next ATX PSU revision?
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post #4 of 6
Taken from Tom's because I'm lazy tongue.gif -
Quote:
+3.3 V - Chipsets, some DIMMs, PCI/AGP/PCIe cards, miscellaneous chips
+5 V - Disk drive logic, low-voltage motors, SIMMs, PCI/AGP/ISA cards, voltage
+12 V - Motors, high-output voltage regulators, AGP/PCIe cards

+5VSB powers the motherboard and USB ports when you are on standby.

Edit: Sauce - http://www.tomshardware.com/reviews/power-supply-specifications-atx-reference,3061-2.html
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post #5 of 6
Thread Starter 
Thank you smile.gif

So if I buy 2400Mhz ram, will a bad 3,3v Affect it?
talking about the NZXT Hale90 V2
Edited by Zillerella - 8/16/13 at 11:47am
    
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post #6 of 6
Quote:
Originally Posted by DuckieHo View Post

Do you thinking -12V will make it through the next ATX PSU revision?

As long as PCI is common on PC motherboards, yes. -5V lasted well past its shelf life because of the ISA slot.
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