I've been playing crysis 2 with all settings on ultra(with the directx 11 ultra and hires texture pack installed).Gameplay is very smooth.But,in any area of the game,suddenly,for 10 to 30 seconds,my fps drops and my character gets slow.If i reload that portion,it works fine.This happens 5/6 times during 2-3 hours of gameplay.
I had the same problem with crysis1,but on that case,it was more frequent.Does anybody know if it's a problem with the game or the graphics card?

Also,if i turn on 3D,the game doesn't start with the 64bit exe,and with the 32bit exe,the screen shows overlapped characters as seen without 3D glasses on 3D movies.

my build is:
Alienware M17x-R3
Nvidia 3D vision
Intel Core i-7 2860Qm(2.5Ghz,with 3.2 ghz turbo boost)
Nvidia geforce GTX 580M(2GB dedicated video memory-Total video memory 4GB)
16GB RAM (1600 MHz)
1TB Hybrid drive.
BDrom drive.