Minimum:

OS: 64bit Versions of Windows 7, Windows 8, Windows 10
Processor: AMD FX Series or Intel Core i3 Series
Memory: 4 GB RAM
Graphics: AMD HD5450 or Nvidia GT430 or Intel HD4000 with 1GB of VRAM (DirectX 11 graphics card required)
DirectX: Version 11
Storage: 50 GB available space
Sound Card: DirectX Compatible soundcard
Additional Notes: Supported Graphics Cards: AMD HD5000 Series, HD6000 Series, HD7000 Series, R7 Series, R9 Series Nvidia GTX400 Series, GTX500 Series, GTX600 Series, GTX700 Series, GTX900 Series Intel HD4000 Series, HD5000 Series

DiRT Rally screenshots