I just went through the demo. It scared the crap out of me.
I was very impressed with the graphics and the FPS. It seems as detailed as Crysis but the minimum FPS runs alot higher. I did about 10 benchmarks Min/Max/Average
Min was high 30's-low 40's, max 50-60+, average mid to high 40's. This was done on max res, max settings, on a 25.5" 1920x1200 samsung.
I know that most gamers are hung up on the visual but this game is worth upgrading your sound if haven't already. You need some decent bass to put you in the mood. There was a few times that my arm hair stood straight up just because of the music and sound effects.
The demo is short and sweet..... and scary.