Help about the rails in PSU

[janoloco]

Question about the rails in PSU

qhi guys..

with my new pc set.. i decided to buy a Cooler Master Real Power Pro 850W over the TT Tough power 850W
because of the reviews posted in newegg

but i been reading about the rails and im very confused...

my set includes 2 8800GTX but it seems like these cards need a Minimum 450W or greater system power supply (with 12V current rating of 30A) each one

And the cooler master psu provides:

+3.3V@25A,+5V@30A,+12V1@18A,+12V2@18A,+12V3@18A,+12V4@18A,+12V5@18A,-12V@0.8A,+5VSB@3.5A

6 rails of 12Volts + 18Amp each
so... how my video cards work on these rails?

can some one help me to understand that?

i also noticed ... the TT Tough power has two of the 4 +12V ratings pushing 30Amps

 

[janoloco]

hello

any body knows about this?

 

[Nagasama]

multiply the 18A by 6(the number of rails)= 108A = no problem.
read this, it wil explain...it will also tell you that you don't need that much power, but with those two cards having good headroom is a good idea:

http://www.techist.com/showthread.php?s=&threadid=131824