I have an FX-4100 with a HD 6850 and 8GB RAM. I can run most games no problem but for some reason I am getting micro-stutter in Assassins Creed Revelations and Fable III (I think I get it in some other games but cant think off the top of my head)I have tried disabling V sync and forcing it through AMD vision engine control center I have put all settings on lowest and the games look horrible but still I get micro-stutter when I look around and when I go into new places on ACR. For ACR I also tried removing a file from its main directory because it was recommended on a thread I found but it didn't fix. The games are in steam so all up to date. I find it weird how I get micro stutter when I thought it was just Crossfire cards that get it?
If you don't have the money (or just want to wait for newer models before upgrading) then your next best option is a program called RadeonPro. Download and install it, then install FRAPS (if you don't have it) and use FRAPS to benchmark worst-case scenario performance in your game. So a big open area where you're fighting a load of guys or just lots of people around. Then you've got your worst-case performance. Then you calibrate RadeonPro to fix your framerate there, and that should eliminate stuttering. Keep in mind if you change your settings (or obviously if you play a different game), you'll need to re-benchmark to get the new framerate to limit it to.
EDIT: Is CAP Catalyst Application Profiles maybe? I never bothered with that stuff myself, but might have made AC2 a bit less jerky on the dual-GPU card I had. Application Profiles were meant to be helpful with dual-GPU setups.
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