I have a nVIDIA GTX280 ... I tried the steam method as well... tried a few different compatabilities and I can also conform this method does not work for me... I tried AA and 4 and 8... It did absolutly nothing regardless of whether or not HDR is on or off.
Are you using the latest driver version, 260.99? I really can't think of a reason driver-forced AA would work on one GPU and not another. Are you sure you did every step? Picked the exe out, changed the profile AND the AA setting? Hit apply?
I am using the STALKER one by the way.
