Recommended:

OS: Windows XP SP3/Vista/Win 7
Processor: 2.3 GHz Quad Core processor
Memory: 2 GB
Hard Disk Space: 20 GB free
Video Memory: 512MB
Video Card: NVIDIA GeForce GTX 560 / ATI Radeon HD 5850
Sound: DirectX 9.0c Compatible
Other Requirements: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)

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