On the ARMA 2 demo benchmark I get an average of 29 FPS whether or not Crossfire is enabled, so my problem is that the second GPU is not being utilized by the game. Settings are at Very High, no AA, and the resolution is set to 1920x1200. I tried the -winxp launch parameter and also renaming the game's executable file, but neither of those fixes worked.
Launch options: -nosplash -world=empty -maxmem=2047
System specs:
CPU: Intel
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RAM: 4GB Mushkin@1066MHz
GPU: Radeon HD4870X2
OS: Vista Home Premium 64bit
