Sorry for taking so long to get back. Im running an Intel Core i7 @ 3.78 , Ati 5870 @ 900 / 1300 and im getting about 35-45 frames with everything on high and AA @ 4X
Every once in awhile the game just closes randomly. But other than that it runs pretty dang smooth. My temps since im watercooling after playing BFBC2 for an hour are around 40 degress celcius
HBAO is something that you won't notice too much when playing the game, since it only affects intersections between objects or other corners. The performance hit for the visual gain is not worth it.
Since I was running dell 1908fp standard monitors, I was hoping to run the game at 3840x1024, but the menu and hud would bleed onto the other screens as if it was meant more for widescreen. I ended up having to drop down to 3072x768 to get everything to position correctly on the middle screen.