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Power requirements for 2 4890s

Hi, I was going to get 3 9800gtx+s but thats really outdated and doesnt have that much memory, I switched to 2 4890s.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.
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More about power requirements 4890s
  1. 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.
  2. I would recommend at least a 750Watt power supply for best performance.
  3. 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 =).
  4. Best answer
    According to XFX http://xfxforce.com/en-us/products/graphiccards/HD%204000series/4890.aspx#4 600watt is what is needed for 2 x 4890 in crossfire.
    You will be fine with the Corsair 650watt!
  5. rolli59 said:
    According to XFX http://xfxforce.com/en-us/products/graphiccards/HD%204000series/4890.aspx#4 600watt is what is needed for 2 x 4890 in crossfire.
    You will be fine with the Corsair 650watt!

    Thanks =)
  6. Best answer selected by zoranzoran.
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