As Bluesnews notes, the difference between Ubisoft’s list and the one on Steam, is minimum specs for the processor: it’s 2.13GHz, not 2.53GHz.
Minimum
- OS: Windows XP (SP3) / Windows Vista (SP2) / Windows 7 (SP1) / Windows 8
- Processor: 2.13 GHz Intel Core 2 Duo E6400 or 2.80 GHz AMD Athlon 64 X2 5600+ or better
- Memory: 2 GB RAM
- Graphics: 512 MB DirectX 10–compliant with Shader Model 4.0 or higher
- DirectX: 9
- Hard Drive: 25 GB HD space
- Sound: DirectX 10–compliant DirectX 9.0c–compliant
- Additional Peripherals Supported: Windows-compatible keyboard, mouse, headset, optional controller (Xbox 360 Controller for Windows recommended)
Recommended
- Processor: 2.66 GHz Intel Core 2 Quad Q8400 or 3.00 GHz AMD Phenom II X4 940 or better
- Memory: 4 GB RAM
- DirectX: 11
- Hard Drive: 25 GB HD space
- Sound: 5.1 surround sound
- Other Requirements: Broadband Internet connection
- Additional Peripherals Supported: Windows-compatible keyboard, mouse, headset, optional controller (Xbox 360 Controller for Windows recommended)