minimal:
reqprocessor: 2.4 GHz Dual Core Processor
reqgraphics: Video Card: NVIDIA GeForce 8500 /ATI Radeon HD 2600
reqmemory: 2 GB(XP)/ 2 GB(Vista)
reqdiskspace: 13 GB free
reqsystem: Windows XP SP3
reqother: Sound: DirectX 9.0c Compatible, Initial installation requires one-time internet connection for Steam authentication; software installations required (included with the game) include Steam Client, DirectX 9, Microsoft .NET 4 Framework, Visual C++ Redistributable 2005, Visual C++ Redistributable 2008, Visual C++ Redistributable 2010, and AMD CPU Drivers (XP Only/AMD Only), videoMemory: 256 MB

recommended:
reqprocessor: 2.3 GHz Quad Core processor
reqgraphics: Video Card: NVIDIA GeForce GTX 560 / ATI Radeon HD 5850
reqmemory: 2 GB
reqdiskspace: 20 GB free
reqsystem: Windows XP SP3/Vista/Win 7