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. I've also tested at 1280x1024 with the lower-end graphics cards, since some of them struggled to deliver completely fluid rate rates at 1680x1050.

Here's our first look at the GX2's true performance, and it's a revelation. This "single" graphics card utterly outclasses the GeForce 8800 Ultra and Radeon HD 3870 X2, producing performance faster than three Radeon HD 3870 GPUs in a CrossFire X team and nearly matching a pair of 3780 X2 cards with four GPUs.

The only fly in the ointment is a consistent problem we've seen in this game with SLI configs using 512MB cards; their performance drops quite a bit at 2560x1600. The GX2 looks to be affected, although not as badly as the GeForce 8800 GT SLI and 9600 GT SLI setups we tested. And, heck, it's still pumping out 60 frames per second at that resolution.