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.

As expected, the GeForce GTX 280 outperforms any other single-GPU solution, cranking out over 50 frames per second at 2560x1600 resolution. However, the dual-GPU cards have a lot of fight in them: the Radeon HD 3870 X2 sticks with the GTX 260 at lower resolutions, and the 9800 GX2 simply trounces the GTX 280. The thing is, the picture changes at 2560x1600, where the GTX 260 pulls decisively ahead of the 3870 X2 and the GTX 280 closes the gap with the 9800 GX2.