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Call of Duty 4: Modern Warfare
We tested Call of Duty 4 by recording a custom demo of a multiplayer gaming session and playing it back using the game's timedemo capability. Since these are high-end graphics configs we're testing, we enabled 4X antialiasing and 16X anisotropic filtering and turned up the game's texture and image quality settings to their limits.

We've chosen to test at 1680x1050, 1920x1200, and 2560x1600—resolutions of roughly two, three, and four megapixels—to see how performance scales.

Well, this is a great game, but it's pretty much CPU limited with its quality settings maxed out along with 16X aniso and 4X AA. At 2560x1600, the multi-GPU configs do separate a little bit, and the 4870 X2 comes out ahead of three GTX 260s in SLI, let alone two.