PC Specs
Steam lists lightweight minimum PC requirements
The minimum spec calls for Windows 7 SP1 64-bit, 4 GB RAM, DirectX 10 and 8 GB storage.
The Steam page lists a modest minimum PC spec: 64-bit Windows 7 SP1 or better, Intel Core 2 Duo e6400 or AMD Athlon x64 4000+, 4 GB RAM, GTX 460 or Radeon HD 4400-class graphics, DirectX 10, broadband internet and 8 GB storage.