Minimum System Requirements
Windows
OS:
Windows® XP Service Pack 2, Windows® Vista
Processor:
3.0 GHz Intel or equivalent AMD processor or better
Memory:
1 GB RAM or better
Graphics:
256 MB video RAM, with DirectX 9 Vertex Shader / Pixel Shader 2.0 support (Nvidia 6800 or better)
Storage:
8GB available hard drive space
Recommended System Requirements
Windows
OS:
Windows® XP Service Pack 2, Windows® Vista
Processor:
1.8 GHz processor
Memory:
512 MB RAM
Graphics:
128 MB video RAM or greater, with DirectX 9 Vertex Shader / Pixel Shader 2.0 support (ATI 9600+, Nvidia 6200+)
Storage:
8GB available hard drive space
These are the requirements the publisher lists on Steam.
