Minimum:

OS: Windows® XP / Windows Vista® / Windows® 7 (only)
Processor: 2.0 GHz Intel® Core™2 Duo E4400 or 2.6 GHz AMD Athlon™ X2 5000+(2.0 GHz Intel Core 2 Duo E6400 or 2.8 GHz AMD Athlon II X2 240 or higher recommended)
Memory: 1 GB Windows XP or 1.5 GB Windows Vista/7 (2 GB recommended)
Graphics: 512 MB DirectX® 9.0c-compatible or higher recommended (see supported list)*
DirectX®: 9.0c
Hard Drive: 11 GB
Sound: DirectX 9.0-compliant sound card
*Supported Video Cards at Time of Release:
NVIDIA® GeForce® 8600/9/200/400/500 series
ATI Radeon™ HD 2600/3000/4000/5000/6000 series
Laptop versions of these cards may work, but are not supported. These chipsets are the only ones that will run this game. For the most up-to-date minimum requirement listings, please visit the FAQ for this game on our support website at: http://support.ubi.com.

Might & Magic: Heroes VI - Shades of Darkness screenshots