The only way I have been able to get crossfire and fullscreen to give me any more than 20FPS is to use radeon pro to override the driver settings.
When I use radeon pro I get 100FPS to 250FPS on single player and multiplayer.
I dont seem to get any degradation, but MP will crash or kick me out after about an hour without fail.
If I dont use radeon pro its unusable for me with a max of 20FPS even though all GPUs are being used 30-40%. So theres a big issues with crossfire in the last patch that hopefully the beta patch today will fix.
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