I've played the Crysis demo recently.
4600x2
2gb Mushkin ram
Gigabyte GA-MA69G-SH3 (Xfire capable)
HIS HD2600XT 512mb
WinXP SP3
I can play it at high settings @ 1280x720. Runs smooth and looks great. I'm kind of iffy on the gameplay though. Sometimes the aiming of the gun appears off relative to the sights and you have to rely heavily on the suit to keep from getting killed (how a guy on a gunboat that looks like spec can tell you're a bad guy is beyond me). Still, the game itself is visually stunning and there are lots of ways to complete tasks (stealth or go in blazing).
I love the shotgun.
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'98 GTP, '01 Bonne