The smoothshader, antialiasing, trueform etc. qualities of the Radeon8500 are not working properly due to unfinished drivers. If you use them, you suffer a big fps loss, crashes etc. fun features.
Now I understand why people have reported such low fps ratings. It's been reported all over that it's not possible to use the special features of the radeon untill the drivers are made over. It's clear ATI released this product way before it was finished. I'm glad I didn't join the betatesters.. =)