Either Crysis and Crysis Warhead has the problem: sometimes they can't run (black and exits). When run, feels all right in menu, but extremely slow (<1 fps) in game, even 1024x768 with lowest setting. I have 64 bit windows 7, entry 15", crysis with 1.2 patch and warhead with patch. DX on v11. Other games like MW2 and Battlefield BC2, NFS 13 runs normally.