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Power requirements for 2 4890s

Last response: in Graphics & Displays
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June 14, 2010 7:43:44 PM

Hi, I was going to get 3 9800gtx+s but thats really outdated and doesnt have that much memory, I switched to 2 4890s. Ok my first question is will my corsair 650w power supply be able to run those 2 . And second of all is the 2 4890s alot better than the 9800gtx+s.
a b U Graphics card
June 14, 2010 7:58:10 PM

9800GTXs have slightly more than 160watt draw at load, so 3 would be around 500watts draw. Add in the CPU, HDDs, mobo, RAM, etc and it would seem that your 650w shouldn't have been able to run 3 9800GTXs. (or at least it's cutting it VERY close for comfort)

Two 4890s will use less power than 3 9800GTXs.
A 4890 is about equal to a GTX275, and both are about 15% better than a 4870/GTX260, which in turn is about 20% better than a 4850/9800GTX.

Two 4890s will probably perform slightly better than 3x9800GTS due to better scaling.
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a b U Graphics card
June 14, 2010 8:21:05 PM

I would recommend at least a 750Watt power supply for best performance.
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June 14, 2010 9:16:33 PM

Bluescreendeath said:
9800GTXs have slightly more than 160watt draw at load, so 3 would be around 500watts draw. Add in the CPU, HDDs, mobo, RAM, etc and it would seem that your 650w shouldn't have been able to run 3 9800GTXs. (or at least it's cutting it VERY close for comfort)

Two 4890s will use less power than 3 9800GTXs.
A 4890 is about equal to a GTX275, and both are about 15% better than a 4870/GTX260, which in turn is about 20% better than a 4850/9800GTX.

Two 4890s will probably perform slightly better than 3x9800GTS due to better scaling.

Thanks alot for the reply but should my 650w be able to take those 2 4890s? I mean it is a corsair =).
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a c 1407 U Graphics card
June 14, 2010 9:37:33 PM

According to XFX http://xfxforce.com/en-us/products/graphiccards/HD%2040... 600watt is what is needed for 2 x 4890 in crossfire.
You will be fine with the Corsair 650watt!
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June 15, 2010 12:50:25 AM

Best answer selected by zoranzoran.
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