I tried HDR in farcry and I wasnt all that impressed with it, but in oblivion it looks amazing. with AF turned up and HDR on, i have to say I didnt miss the AA all that much. Of course, that was on my 7900GT before it died on me, so I'll probably end up using both on my X1800XT when it gets here tomorrow. Might have to reduce my settings to 2xAA/4xAF in order to make it playable though.