I just found out about this function. Can it be turned on manually in the game graphics settings or is it done only in Nvidia control panel(since I have Nvidia). And how much will it cut my fps, i have 9800 gtx+, play everything maxed out at 1920x1200. I get usually about 35 fps average. So how is it gonna be with this ambient occlusion? And by the way is it worth it to turn on, will it significantly improve the graphics?thanks

Why not just try it out yourself?