minimal:
reqprocessor: 2 GHz Dual Core CPU
reqgraphics: GeForce 400 or higher, AMD Radeon HD 4000 or higher, Intel HD 4000 or higher
reqmemory: 4 GB RAM
reqdiskspace: 4 GB available space
reqsystem: Ubuntu/SteamOS (latest)
recommended:
reqprocessor: 2.5 GHz Quad Core CPU
reqgraphics: GeForce 500 or higher, AMD Radeon HD 5000 or higher
reqmemory: 8 GB RAM
reqdiskspace: 4 GB available space
reqsystem: Windows 7 (64 bit) / Windows 8 (64 bit)