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Why do you have a 5970 and a 5870?
Yea the game is badly optimized, so i would expect this kinda stuff from it.. i dont get any stuttering with my 5870 just some graphical lag.. which isn't really noticeable, due to the motion blur.

nothing wrong with having both, sailor
to the OP you'll probably find that the fps difference between running just the 5870 OR the 5970 won't be much. the game sucks are multi gpu configs (more so ati than nvidia i believe)
with the 5970 i was geting good fps but not very smoth in some maps very jurky and lagy but with the 5870 with same settings i was geting lower fps but smother game play.i think at this parts of the maps the gpus on the 5970 droping to 40% on both and on the 5870 the gpu is 100% at all times may be driver problem will im hoping so or i be ****ed off