You can't play any dx11 game maxed out, lol.
I'm sure the list grows daily. With that said everybodys definition of max is different. Start bringing AA into the equation and max becomes a whole lot harder to obtain and define. I certainly can't run crysis at 2560x1600 very high settings and 16xaa, but I can run it at the same settings with no AA. Is that to say I'm not playing the game maxed out? You be the judge.
I'm sure your 4850 will hold it's own in almost any game with no AA @1440x900, with very few settings turned down