My source is my personal experience with having a GTX and 2 x 3870's. The GTX was able to play CoD4 at 1680x1050 16x/16x with no hesitation. The 3870's in Crossfire caused me to reduce my resolution to 1024/1280 before it was playable. I am hoping that this problem is taken care of in Catalyst 7.12. I just recently installed the Multi-GPU patch from M$ and haven't had time to play CoD4. If that fixes the problem, I'll let you know.
i'm getting avg of 83fps in COD4 4xaa/16xaf 1920x1200 with my 3870's, try the 7.12's they're nice for me in Vista64
Q6600 G0 @ 3.80ghz 1.45v(bios), Asus Maximus Formula X38
Powercolor HD4850 Crossfire, 4x2GB Team Group
Dell 2407WFP, OCZ 700W,Mountain Mods U2-UFO
D-Tek Fuzion + Nozzle, MCW30, DDC Ultra+Alphacool, PA120.3
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