Half-Life 2: Episode Two
We used a custom-recorded timedemo for this game, as well. We tested Episode Two with the in-game image quality options cranked, with 4X AA and 16 anisotropic filtering. HDR lighting and motion blur were both enabled.

This game doesn't work out so well for the three-way SLI setup. Even at four megapixels, the dual-GPU system proves just as fast, and at 1920x1200, two 8800 GTs are nearly as quick. Those two 8800 GTs also deliver a very playable 60 frames per second at 2560x1600.

Since several GPU configs can run Episode Two pretty well at this resolution, and since we hadn't had much success with three-way SLI scaling at 4X AA, I thought this might be a good opportunity to test at higher AA levels. I ran a quick test at 2560x1600 with two-way and three-way SLI using Nvidia's 8X and 16X coverage sampled AA modes.

Well, it was worth shot. If you can't quite tell, those two lines are overlapping. Turns out you can run either setup at 8X or 16X CSAA without any performance penalty.