Crysis -
Minimum System requirements (Crysis was made to be played on a wide variety of systems)
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
(on a side note, I pre ordered my copy of GTA IV yesterday
)