1680x1050. I don't think that should be a problem though... I see better results on benchmarks with this card at that resolution. I forced 32x AA and it helped a little, but I can't think of what else to do to make my card stay the workhorse. I know it can, because it does sometimes, (most of the time it does in Mafia II) and also I set it to prefer max performance for 3d applications.