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We’re using Very High DirectX 10 settings here, yet, at 1680x1050, a pair of Radeon HD 5870s performs comparably to two or three GeForce GTX 480s. Clearly, there’s a platform bottleneck in play.
Similarly, 1900x1200 shows the same performance ceiling in place. The single Radeon HD 5870 and GeForce GTX 480 boards lose a bit of frame rate, but are still on par with each other.
Finally, at 2560x1600, there’s enough graphics load to differentiate every configuration. Going from one to two to three GeForce GTX 480s buys a sizable gain each step of the way, though scaling from one to two is most impressive. In comparison, the jump from one to two Radeon HD 5870s is nice if you’re not using AA. Turn it on and you’ll incur a huge performance hit—something we’ve seen several times in the last two years.