Minimum System Requirements
OS: Windows XP/Vista
Processor: Intel Core 2 DUO @ 1.8 GHz/AMD Athlon 64 X2 @ 2.4 GHz
Memory: 1.5 GB
Hard Drive: 16 GB Free
Video Memory: 256 MB (nVidia GeForce 7900/ATI Radeon X1900)
Sound Card: DirectX Compatible
DirectX: 9.0c
Keyboard & Mouse
DVD Rom Drive

Recommended System Requirements
OS: Windows XP/Vista
Processor: Intel Core 2 QUAD @ 2.4 GHz/AMD Phenom X3 @ 2.1 GHz
Memory: 2 GB (2.5 GB for Vista)
Hard Drive: 18 GB Free
Video Memory: 512 MB (nVidia GeForce 8600/ATI 3870)
Sound Card: DirectX Compatible
DirectX: 9.0c or 10
Keyboard & Mouse
DVD Rom Drive

also known as:
GTA IV
GTA 4