Crysis will no doubt be a fairly demanding game. If your deciding to buy the game this is some handy info.

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 betterRAM: 1GB (1.5GB on Windows Vista)Video Card:NVIDIA GeForce 6800 GT, ATI Radeon 9800 Pro (Radeon X800 Pro for Vista) or betterVRAM:256MB of Graphics MemoryStorage:12GBSound Card:DirectX 9.0c CompatibleODD:DVD-ROMOS:Microsoft Windows XP or VistaDirectX:DX9.0c or DX10

Recommended Requirements

CPU:Core 2 Duo/Athlon X2 or betterRAM: 1.5GBVideo Card:NVIDIA 7800 Series, ATI Radeon 1800 Series or betterVRAM:512MB of Graphics MemoryStorage:12GBSound Card:DirectX 9.0c CompatibleODD:DVD-ROMOS:Microsoft Windows XP or VistaDirectX:DX9.0c or DX10