Crysis graphics issues

Well its either down to bad drivers of more probably your just pushing things that little bit too far. What settings does the game Auto detect for the system and do you still have the same issue if you leave the settings where the game selects them ?
Also does it do this with other games ? and do you have the game patched up to date ?
There are lots of settings you can play with to make life easier for your system, shadows is one that will take a lot of performance away and while it makes the game look a lot better with then enabled it really takes little out of the game play to turn them down if not off.
I generally start with internal shadows and work from there when trying to set up a demanding game.

Mactronix