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11.14.2007 at 07:40AM PST, ID: 22960182
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Power supply needed for dual 8800 GT's

Asked by Zraxius in Power Supplies / UPS, Video Cards

Tags: power, 8800, supply, gt, needed

I am currently about to receive a single EVGA nVidia 8800GT KO video card, and would like to run two of these cards in SLI mode when needed sometime in the future.  A single card requires a minimum of 22 amps on the 12 volt rail, and 24 amps on the 12 volt rail for 2 cards in SLI mode.  I have purchased an OCZ Game X Stream 700w PSU which states has a max current of 18 amps on each of the 4 separate 12 volt rails. The PCI-e rail no. 1 states a max overcurrent limit of 20.5 amps, and the PCI-e rail no. 2 states a max overcurrent limit of 48 amps.

Since most power supplies I've looked at print that they have only 18 amps on 2, 3, or 4 separate 12v rails, I'm confused about why the amp requirements for this graphics card is so high.  I read that you can roughly estimate the amps on a PSU's 12 volt rail by adding all the separate rails together.  Is this true? Does my PSU have enough juice to power two of these cards?

PSU shown here: http://www.newegg.com/product/product.asp?item=N82E16817341002Start Free Trial
[+][-]11.14.2007 at 01:29PM PST, ID: 20284063

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Zones: Power Supplies / UPS, Video Cards
Tags: power, 8800, supply, gt, needed
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Solution Provided By: sparkmaker
Participating Experts: 4
Solution Grade: B
 
 
[+][-]11.14.2007 at 07:01PM PST, ID: 20286167

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[+][-]11.15.2007 at 08:48AM PST, ID: 20290372

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[+][-]11.15.2007 at 03:41PM PST, ID: 20294025

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[+][-]11.15.2007 at 03:50PM PST, ID: 20294097

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[+][-]11.16.2007 at 04:18PM PST, ID: 20302595

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[+][-]11.17.2007 at 12:26AM PST, ID: 20303704

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