My powersupply - Upgrade for ATI 4890 help.

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The 650 is a great psu it should have no problem with a 4890. i run two 4850s on a 550vx and that eats up much more power. As for installation it's cake. Just make sure you get both motherboard connectors in the 24 pin and the 4 pin.

would a 750W psu be able to support 4890 crossfire?

Assuming it isn't a piece of junk with 4 12c rails and no amps to speak of then yes, it should handle it no prob.
 
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