The first game I played in Crossfire mode was F.E.A.R. On the X1900 Crossfire, I was able to comfortably play the game up to 1600x1200 4x AA 16x AF. There were a couple of hiccups, but it was almost totally comfortable. The X1800 Crossfire was comfortable up to 1600x1200 no AA no AF, or 1280x1024 4x AA 16x AF. The X1600XT Crossfire was comfortable up to 1024x768 4x AA 16x AF.
Star Wars Empire At War is one of my favorite recent games. A RTS (Real Time Strategy) game with many mini-games, EAW is a game you either like or hate. All three Crossfire setups played the game without difficulty, even when many enemy starships crowded the screen.
Call of Duty 2 is the latest FPS (First Person Shooter) from Activision. The game is a great WW2 shooter, and if you haven't played it yet, I would strongly suggest it. Crossfire doesn't seem to have much effect in the game, with frame rates about the same with a single or two cards. COD2 is an interesting case of not having a performance increase when Crossfire was enabled.
Oblivion is the latest most beautiful game out there. If you have a X1900XTX card or a X1800XT card, you can fully enjoy the game in all of its visual splendor. The X1900XT auto-detects the settings to maximum and 1024x768 with HDR enabled. The game runs smooth as silk on the X1900XTX and X1800XT. Unfortunately, the game doesn't support Crossfire mode and will likely require a patch or newer drivers to give a performance increase with AFR.
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