your specs are good, your card is bad. I mean at the resolution you play I'm suprised you can play games:P jks
Seriously though, that card I never understood because it can't even make a playable framerate for DX10 games:S
It actually recommended everything set to Medium at that resolution, but I found it a little jittery and didn't like it so I changed everything to low settings. But at the low settings it seems to handle DX10 ok. Maybe because this specific card has a 710 MHz clock helps it a little. But then again, for Crysis, you usually play a game like this for the graphics on very high settings I suppose.
I mean the game-play itself is pretty lame compared to others so...but I guess it's meant to be multi-palyer and the episodes are just "training".