CPU:A dual core processor is required:AMD: Athlon X2 2.8GHz / Intel: Core 2 Duo 2GHz 

RAM:2 GB

VGA:DirectX 10 compatible or later with 512MB RAM
AMD: ATI Radeon 3650, 4450, 5550, 6450 or higher (per series)
NVIDIA: GeForce 8600GT, 9500GT, GT120, GT430, GT520 (per series)  

DX:DirectX®: 9.0c

OS:Windows XP, Windows Vista or Windows 7  

HDD:8 GB

Sound:DirectX 9.0c compatible 

CPU:Quad Core 2.66GHz Intel or 3.2GHz AMD

RAM:4 GB RAM

VGA:DirectX 10 compatible or later with 1GB RAM

DX:DirectX®: 10

OS:Windows 7

HDD:8 GB HD space

Sound:DirectX 9.0c compatible

Recommended peripheral:Mouse and keyboard, Xbox360 controller also supported

Note: To run at maximum settings, with high level textures and the like, Remedy recommend a quad core CPU and “a top of the line graphics card.”