My guess is that the demo isnt very stable performance wise? I played the original non patched version and was freaking out. My GX2 was not even getting close to the benchmarks i saw on Toms Hardware. Then i got the 1.2 going, and it was a helluva lot better. BUT, since its a demo i dont think you can patch it!
Two things catch my eye here. One, it's a demo. They are never perfect and can flaw for no reason. 2, your on a video card that crysis didn't even know existed at that time in it's development stage and it possibly doesn't know what to do with it/it's drivers.
"as a fanboy i refuse to admit it and will pull countless things out of my butt to disprove it"
Team Thelegorm! Total Kills: 21 (i iz in uor profile, editsing your sigz)