DiRT Showdwon System Requirements

Minimum:

OS: Windows Vista or Windows 7
Processor: AMD Athlon 64 x2 or Intel Pentium D @3.4Ghz
Memory: 2 GB RAM
Graphics: AMD HD2000 Series or Nvidia 8000 Series
Supported Graphics Cards: ATI Radeon HD2000 Series, HD3000 Series, HD4000 Series, HD5000 Series, HD6000 Series, HD7000 Series Nvidia GeForce 8000 Series, 9000 Series, GTX200 Series, GTX400 Series, GTX500 Series
DirectX®: DX9
Hard Drive: 15 GB HD space
Sound: DirectX Compatible Sound Card
Other Requirements: Broadband Internet connection

Recommended for DX11:

OS: Windows Vista or Windows 7 64 bit
Processor: AMD Bulldozer or Intel Core i7
Memory: 4 GB RAM
Graphics: AMD HD6000 Series or Nvidia GTX500 Series
Supported Graphics Cards: ATI Radeon HD2000 Series, HD3000 Series, HD4000 Series, HD5000 Series, HD6000 Series, HD7000 Series Nvidia GeForce 8000 Series, 9000 Series, GTX200 Series, GTX400 Series, GTX500 Series
DirectX®: DX11
Hard Drive:15 GB HD space
Sound: DirectX Compatible Sound Card
Other Requirements:Broadband Internet connection