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.

The Radeon HD 4850 is an absolute monster in Call of Duty 4, matching the performance of the dual-GPU 3870 X2. That puts the 4850 comfortably ahead of the GeForce 9800 GTX with each resolution we tested. Heck, the Radeon even manages to hang with the GeForce GTX 260 until we hit a display resolution of 2560x1600.