butt.. 5770 doesnt come with dx11?
All 5xxx series cards support DX11.
To "max" out Crysis and Crysis 2, you will need a 5970. Remember, Crysis is such a demanding game that even the BEST offerings from ATI/NVIDIA struggle to cope adequately.
ie Crysis/Crysis Warhead/Crysis 2 (assuming)/Metro 2033 is the exception to the rule.
Other titles you can "max" out using a MINIMUM 5850 at that res.