well, max at what resolution. I am assuming at 1680x1050, 1920,1080, or 1920x1200. I have a 5870 and can not max either of those two games. Crysis kills everything, and Farcry two takes a big leap when going from high detail to very high detail. I was running FC2 at 1680x1050 on High at AAx4. There isn't much change on anything above that. And crysis, I don't even try to use AA, Just High. Those are 2 very bad games to try and run with all settings on maximum settings.
Look at these benches, and remember benches dont always show real gameplay. I know I score higher in the FC2 bench than I actually get in game. In addition this test bed is an Intel Core i7-975.