I just figured it out. I took the overclock off on my i7 920 and put my bios at default and now im playing crysis at max in crossfire with fps in the 50s. Smooth as silk. And now when I put just 1 card in action I get fps in the 20s. I guess crysis doesnt like an overclocked cpu. But with the cpu at default my fps went down in fear 2. I dont understand? But heck I still get fps in the 100s. But could anyone explain why crysis would perform better with a i7 920 at 2.66 rather than 4ghz?
I'm not sure why yours is doing this. I also have an i7 920 with 5870's in CF. It ran as smooth as can be at 3.5Ghz. I probably could go higher, but from Benchmarks I've seen, it wouldn't improve performance. Even 2.6Ghz is near the limit on what would help.http://www.xbitlabs.com/articles/video/display/radeon-hd5870-cpu-scaling_4.html#sect1