Crysis will no doubt be a fairly demanding game. It will require a good system to perform well. However, CryEngine2 is very scalable so lower end machines will still stand a chance. Here are the official, and complete system requirements for Crysis.
Minimum Requirements
CPU: 	Intel Pentium 4 2.8 GHz (3.2 GHz for Vista), Intel Core 2.0 GHz (2.2 GHz for Vista), AMD Athlon 2800+ (3200+ for Vista) or better
RAM: 	1GB (1.5GB on Windows Vista)
Video Card: 	NVIDIA GeForce 6800 GT, ATI Radeon 9800 Pro (Radeon X800 Pro for Vista) or better
VRAM: 	256MB of Graphics Memory
Storage: 	12GB
Sound Card: 	DirectX 9.0c Compatible
ODD: 	DVD-ROM
OS: 	Microsoft Windows XP or Vista
DirectX: 	DX9.0c or DX10
Recommended Requirements
CPU: 	Core 2 Duo/Athlon X2 or better
RAM: 	1.5GB
Video Card: 	NVIDIA 7800 Series, ATI Radeon 1800 Series or better
VRAM: 	512MB of Graphics Memory
Storage: 	12GB
Sound Card: 	DirectX 9.0c Compatible
ODD: 	DVD-ROM
OS: 	Microsoft Windows XP or Vista
DirectX: 	DX9.0c or DX10
http://www.crysis-online.com/Informa...0Requirements/
Ha ha I just got a 8000GTX with a Q6600 

 Smooth like butter 
