If you think your PC has the balls to run Crysis at its very highest settings, then there's a small article over at Planet Crysis that you should read.
Okay, when I say "very highest", I'm not talking about moving all the in-game sliders to the far right. To see what pain Crytek's shooter is truly capable of dishing out on your humble PC, you'll need to dive into the game's configuration files and tweak a few settings.