check your motherboard specs as well, the board needs to have two x16 or x8 pci express lanes WHEN running SLI for good performance.
a lot of boards out there advertise SLI/crossfire support or two x16 pciex lanes. But when you read the fine print some of them unfortunately run x1 speeds in one slot and x8 in the other while running in SLI or crossfire modes. your wont see much of a load of difference when running x8 speeds on both pciex slots vs 16x/x16. but you will feel the pinch when one of the slots is running in x1.
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