Minimum: 1.2GHz Intel Pentium 4 or AMD Athlon processor or equivalent, 256MB RAM, 64 MB Video Card w/Hardware T&L (GeForce 2/Radeon 7500 or better), DirectX 9.0c compatible sound card, 1.7 GB of free hard drive space, Direct X 9.0c (included) Recommended: 1.8GHz Intel Pentium 4 or AMD Athlon processor or equivalent/better, 512 MB RAM, 128 MB Video Card w/ DirectX 8 support (pixel and vertex shaders), DirectX 9.0c compatible sound card, 1.7GB of free hard drive space, DirectX 9.0c (included) SUPPORTED OPERATING SYSTEMS: Windows 2000 (plus Service Pack 1 or higher), Windows XP (Home or Professional) (plus Service Pack 1 or higher) *Requires Sid Meier's Civilization IV to play