The weakest part of my compuer is???

I'm puzzled!! While playing the crysis demo i run task manager, and it says my processor is being pushed to 80%, its a pentium 4 with hyper threading (fake dual core) I-like-sticks

Well first, hyper threading doesn't hold a candle to actual dual cores. So, if you want an actual multi-core experience, you'll have to spring money for actual multiple cores.

it has 1mb of cache and runs at 3ghz. Now i woulda thought it was the weakest component in my computer i'm getting about 10fps at all high settings, i have 2gb of ram running at 667mhz and a nvidia geforce 7900gtx. Is my ram letting me down?? I think the demo thinks i have a real dual core if that makes any difference.I-like-sticks

You graphics card is a bit weak ... 7900 isn't the best there is. For DX9, 7950 is about as good as it gets, and you'll want to get an 8800 if you want to see really great graphics.

Look, with your setup, I'm afraid you'll never be able to get the highest graphics settings going, I'm afraid. At low settings, though, you could play Crysis just fine I imagine. Just be aware however that the whole selling point of Crysis is its graphics so there's no point if you can't see them. :( sorry for the bad news.

On the bright side, the newly released nVIDIA GeForce 8800GT is around $250-$300 and is an amazing deal. It has almost the ability of the best card that nVIDIA has, at nearly half the price.

Crysis is very GPU intensive. What resolution are you running the game at and what settings? Its your graphics card that is holding you back IN THIS GAME. Your CPU is pretty week though.

Do you have AA enabled? You should be getting playable framerates at medium resolutions.