Problem he is possibly having if he is running the last retail patch, is probably not enough video ram for the settings he's trying to run. He should change textures from original to very high and turn trees and buildings down to medium because the card is fast enough it just doesnt have enough vram. Also turn AA off or down to 2x as it doesnt really do anything yet anyway.
I used to have GTX580's 1.5GB cards in SLI and the stutters were traced to overrunning the onboard vram. I now have 3GB GTX580s and no stutters. The retail patch even runs smoothly for me now and the latest beta runs even better.
The game used to use nearly 2GB Vram in the retail patch with all settings at maximum at 1920x1080 res. This is reduced in the latest beta to about 1.6GB on average but you can see it still exceeds available Vram for the standard 1.5GB GTX580/590 cards. (GTX590 has 3GB total with 1.5GB per core)
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