I'm running Windows XP x64 and Vista x64 (dual booting) on a 2 x HD3870 setup and I haven't seen that problem. Though the last time I played COD4 was on 8.3. I had problems enabling Crossfire after installing 8.4 in XP and ended up having to clean install to fix it. I have 8.5 installed but haven't gamed on it yet. Will try 8.5 when I get home (out of town at the moment).




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