MINIMUM:OS: Windows XP SP3
Processor: Intel Core 2 Duo
@ 2Ghz / AMD Athlon 64 X2 equivalent
Memory: 2 GB RAM
Graphics: NVIDIA GeForce 8600 / ATI Radeon HD 2600XT (256 MB memory)
DirectX: Version 9.0
Storage: 6 GB available space
Sound Card: DirectX Compatible
Additional Notes: Initial installation requires one-time internet connection for Steam authentication
RECOMMENDED:OS: Windows Vista/7
Processor: 2.4 GHz Quad Core processor
Memory: 4 GB RAM
Graphics: NVIDIA GeForce 9800 GTX/ATI Radeon HD 4850 (512+ MB memory)
DirectX: Version 9.0
Storage: 6 GB available space
Sound Card: DirectX Compatible
Additional Notes: Initial installation requires one-time internet connection for Steam authentication