Minimum configuration:

Operating System: Windows Vista SP SP1 or Windows 7 or Windows 8 (both 32/64bit versions)
Processor: Intel Core 2 Quad Q8400 2.6 GHz or AMD Athlon II X4 620 2.6 GHz
RAM: 2GB for Windows Vista, Windows 7, Windows 8
Video card: Nvidia GeForce GTX 260 or AMD Radeon HD 4870 (512MB VRAM with Shader Model 4.0 or higher)
DirectX: DirectX June 2010 Redistributable
Disk Space: 30 Gb
Sound: DirectX compatible sound card with latest drivers
Peripherals: Windows-compliant keyboard and mouse required, optional controller

Recommended configuration:

Operating System: Windows Vista SP2 or Windows 7 SP1 or Windows 8 (both 32/64bit versions)
Processor: Intel Core i5 2400S 2.5 GHz or AMD Phenom II x4 940 3.0 GHz or better
RAM: 4GB or more
Video card: Nvidia GeForce GTX 470 or AMD Radeon HD 5850 (1024MB VRAM with Shader Model 5.0) or better
Supported video cards at the time of release: Nvidia GeForce GTX 260 or better, GT400, GT500, GT600, GT700 or AMD Radeon HD4870 series or better, HD5000, HD6000, HD7000 series*