I'm guessing your probably trying to run it at max settings judging by your sig. Stuttering can be a result of the frame buffers on the graphics cards filling up. Anti-Aliasing can be a big cause of this, try reducing the AA.
LOL try your old screen settings and see if you have stutter so 1440x900.
Your stutter problem with your cards is that something is accessing the VRM,fan etc every second or so.
This will cause stutter at higher resolutions which you have not noticed at lower resolutions.
I don't know if this will work but start the game go back into the menu and change your resolution to anything else go back into the game then go back into menu and change your resolution back and see if that stops it.
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