I'm on a Q6600 (running @ stock 2.4) with a GTX 260 OC.
I get pretty much between 25-30 FPS. I'm running at 1920 x 1200 @ 100% fillrate and no matter if I use low settings of very high, it seems to make little difference to frame rate +/- 1 or 2 FPS.
I'm inclined to think there's an issue somewhere, it's just whether BIS or the community can clearly demonstrate the problem and get it resolved. Somethings not quite right...
I mean look at this guy here. Here's got a lower spec machine than me, and yes he's running in a lower resolution, but his game is MUCH smoother than mine.