[citation][nom]cangelini[/nom][/citation]
Well, even though I know that guy did not read where it stated that you used 8.8 drivers, one thing I'd like to know is why your performance with Ati cards is so low when AA is on? It's nothing like that on my system. (I'm using Cat 8.9, E7200, HD 4850, 4GB of Ram, and Vista 64)
Are you using the ingame setting to set the AA? I use 2 or 3 clicks into the slider and get the same FPS as no AA, and if I set the slider all the way to the max I lose about 4-5 fps max (I used fraps, I have that habit of checking my performance).
Also my last question is how can you tell how much AA is applied (i.e. you stated 4x AA set ingame)? Are you counting each step on the slider as 2x AA?