You said you had graphic corruption with adaptive AA too? It's a transparency AA, you shouldnt have such problems, I run it on my old nvidia card with no problems. There is also something called "Catalyst AI" which can control some optimizations? If you have something like it, take a look what options are there, disable the thing maybe?
But as you see, Its a lot of guessing from my part as I am nvidia user, you should wait for somebody who knows ATI better (a lot of people here bought ATI cards when SH4 came out...).
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