I think we're talking about different things. Sorry it's kinda hard to describe what's going on. It's not that the card can't handle it-- because I've got it at 1600x1200 everything turned up and the card runs great, say, in Hellfire-- except for this "stutter" when I activate AF. It'll still be running an average of 45fps but there's a stuttering lag every second ish. Looks nasty.
One of the GM's I spoke with mentioned he knows sometimes this can be a card memory problem.
Does that help anyone? What kind of memory problem? I have overclocked before; I just hope that's not it.