OS: Windows XP or Vista (32-bit) (64-Bit versions of Windows not supported) Processor: Intel 2.8 GHz or faster (3.0 Ghz or faster for Vista) or AMD Athlon 2800+ for Windows XP / AMD Athlon 3800+ for Windows Vista Memory: 1 GB or more Graphics: Video card with 128 MB or more memory, Pixel Shader 3.0 support, and one of these chipsets is required: ATI Radeon X1300 Pro or greater, NVIDIA GeForce 6600 GT or greater. NOTE: NVIDIA 6800XT/LE, 7100GS, 7200GS/LE, 7300 GS/GT are not supported. NVIDIA SLI and ATI Crossfire modes are not supported. DirectX®: DirectX 9.0c compatible Hard Drive: 9.0 GB or more free space Sound: DirectX 9.0c compatible (For Creative Sound Blaster Audigy cards running under Windows Vista you should expect lower performance) Special Requirements: 2-12 players and 24 with dedicated server; Cable, DSL, or faster connection