Trolling some of the Crysis forums, I found this neat little thread about the new single player demo:
http://forums.ea.com/mboards/thread.jspa?threadID=300093&start=0&tstart=0
Just a little paraphrase from one of the posts there:
More info, with my QX6850 + 8800 Ultra + 2Gb DDR2 I get:
5fps (1600*1200, 16aa, Very High settings)
8fps (1600*1200, 4aa, Very High settings)
12fps (1600*1200, 4aa, High settings)
25fps (1280*1024, 8aa, Medium settings)
Nvidia Driver version: 163.69
Message was edited by: NickCrysis (EA.com)
If this is representitive, I think "Houston, we have a serious problem here".