Ive tried lots of different affinity masks, but mainly to use 2 3 or 4 cores. makes no difference.
My ram seems fine, never see it go above 2.5gb total usage while playing even with vent on and stuff.
Did you try turning off catalyst AI?
I've noticed fps drops on my 4870, but also borderlands was having a huge memory leak due to 10.7's with the only solution being go back to 10.4 or turn off AI.
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