I'm using a 7900GS with AA and AF settings set up using Nhancer. Get it and seet up as per the instructions in the thread SL45 linked you to. Works a treat and haven't had a problem with it.
How much system RAM do you have? That will have a fairly big bearing on your frame rates if not more than you card. If you get a severe drop in FPS, then ease back on the AF and AA settings from the suggested and test it to see what difference it makes.
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