Here are the Supreme Commander system requirements.

Minimum

* Microsoft Windows XP Service Pack 2, Vista
* 1.8 GHz processor
* 512 MB RAM
* 8GB available hard drive space
* 128MB video RAM or greater, with DirectX 9 Vertex Shader/Pixel Shader 2.0 support
* Sound card, speakers or headphones
* 56.6 Kbps Internet connection required

Recommended

* 3.0 GHz Intel or equivalent AMD processor or better
* 1GB RAM or better
* 8GB available hard drive space
* 256 MB Video RAM, with DirectX 9 Vertex Shader/Pixel Shader 2.0 support
** (Nvidia 6800 or better, ATI X800 XL, X 1300 or better)
* Internet connection with Cable/DSL speeds