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Old 10-08-2006
Delta Delta is offline
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Default Confusion about 12v rails

HI, Great Site you have Jonny! Excellent reviews! Even with all the reviews, I'm still lost in trying to pick out a power suppliy for my new build.

My new to be system:
e6700 ( wanting to overclock it )
p5w dh deluxe
2gb corsair 6400c4
evga 7900 gto ( maybe planning to go sli)
2x WD 250 gb drives ( may want another drive later )
4x 120mm fans

What i am confused about is,DO I need a PSU with more than one 12v rail.
EG: Zippy G1-600w (sli). The zippy has only one 12v rail. Does running 2 GPU's in sli require two 12v rails.

On the 7900 GTO box it says to use a +12volt current rating of 22 amps! If i get another GPU would i need somthing rated at 44 amps?

I am totally confused here! IS there a guide somewhere i can read about on how to choose a psu.

Thanks!
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Old 10-08-2006
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Look at the Corsair HX520W, Delta. Here is the best price I could find on it:

http://www.zipzoomfly.com/jsp/Produc...odlist=froogle
Corsair HX520W w/ SLi
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Old 10-08-2006
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Quote:
Originally Posted by Delta View Post
EG: Zippy G1-600w (sli). The zippy has only one 12v rail. Does running 2 GPU's in sli require two 12v rails.
Not with that monster... Zippy's not kidding when they say it can do 40A@12v

The recommendation of 22A is meant to include the entire system... you could probably run two 7900's off a 500W Enhance/Silverstone dual 12v unit without issues. The Zippy won't even flinch.
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Old 10-08-2006
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Quote:
Originally Posted by Oklahoma Wolf View Post
The Zippy won't even flinch.
We will find out next week, right Jonny?
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Old 10-08-2006
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Huh? What? Oh... Yeah. w/ luck.
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Old 10-09-2006
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That HX520 is nice, and modular! would the HX620 be overkill?

But I still am a little confused on why PSU need more that one 12v rail ( i sound like a total nub here).

Last edited by Delta; 10-09-2006 at 01:15 AM.
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Old 10-09-2006
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Quote:
Originally Posted by Delta View Post
That HX520 is nice, and modular! would the HX620 be overkill?

But I still am a little confused on why PSU need more that one 12v rail ( i sound like a total nub here).
By separating the 12V rail into separate circuits, or rails, you isolate EMI noise from one component to another and provide protection from some components if one one another rail were to short out.
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Old 10-09-2006
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Yea, the HX620W would be overkill.
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Old 10-09-2006
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Hey, THanks! I will look into gettin the Corsair HX520W. Love the way the modular cables can clean up the look of a case!

Thanks again!
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Old 10-09-2006
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Np. Modular connections is great to have
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