System Requirement (minimum):
OS: Windows XP SP3, Windows Vista SP1, Windows 7
Processor: 2.0Ghz Dual core CPU (any Core 2 Duo or AMD X2 or better)
Memory: 1GB (XP), 2GB (Vista), 2GB (Windows 7)
Graphics: 256MB Video Card using Shader Model 3 (Nvidia GeForce 8800GT, AMD Radeon 3850 and above)
DirectX®: 9.0c
Hard Drive: 20 GB space free (10 GB free after install)
Sound: Laptop and Notebook users will need to download the newest Nvidia 280.26 or AMD Catalyst 11.8 drivers. Recommended
OS: Windows 7
Processor: Any Quad-core Intel or AMD Processor
Memory: 1GB (XP), 2GB (Vista), 2GB (Windows 7)
Graphics: 512MB Video Card using Shader Model 3 (Performance equivalent to an AMD Radeon 5750 or better)
DirectX®: 9.0c
Hard Drive: 20 GB space free (10 GB free after install)
Sound: Laptop and Notebook users will need to download the newest Nvidia 280.26 or AMD Catalyst 11.8 drivers

Download:
Game Warhammer 40000 Space Marine [part 1] 
Game Warhammer 40000 Space Marine [part 2]
Game Warhammer 40000 Space Marine [part 3]