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World in Conflict
In this game, as well as other games mind you, we see that at lower resolutions, Sapphire HD 5970 OC is limited by the CPU power. It might sound strange, but we're calling 1920x1200 a "lower resolution" as the HD 5970's optimum resolution is 2560x1600.
Geforce GTX 295 still fares well in all the tests and is only 10-15% slower than Sapphire's HD 5970 OC card in World in Conflict. Single-GPU HD 5870 is slower by about 40% at the highest resolution and antialiasing on.
HAWX shows that Crossfire runs just fine on the older HD 4870 X2 card, which runs about 15% slower than the HD 5970. The HD 5870 ran about 40% slower than Sapphire HD 5970 OC. Nvidia's top model trails Sapphire's card by about 10%, whereas the highest resolution with AA on results in HD 5970 beating it by about 30%.