Minimum 3D hardware accelerator card required - 100% DirectX(R) 9.0c-compliant 32 MB Hardware T&L - capable video card and the latest drivers*, English version of Microsoft(R) Windows(R) 2000/XP, Pentium(R) III 1.8 GHz or Athlon(TM) XP 1800+ or higher processor, 256 MB of RAM, 2.8 GB of uncompressed hard disk space (plus 320 MB for the Windows swap file), A 100% Windows 2000/XP-compatible computer system including: DirectX 9.0c (Included) 100% DirectX 9.0c-compliant true 16-bit sound card and drivers 100% Windows 2000/XP-compatible mouse, keyboard and drivers 100% Windows 2000/XP-compatible gamepad (optional) (Game controller with 10 or more buttons and dual analog thumb sticks required) *Supported Chipsets for Windows 2000/XP NVIDIA® GeForce™ 3/Ti series NVIDIA® GeForce™ 4/Ti series NVIDIA® GeForce™ FX 5700 and later series NVIDIA® GeForce™ 6800 and later ATI® Radeon™ 8500 ATI® Radeon™ 9000 ATI® Radeon™ 9600 ATI® Radeon™ 9800 and later *Important Note: Some 3D accelerator cards with the chipsets listed here may not be compatible with the 3D acceleration features utilized by GUN. Please refer to your hardware manufacturer for 100% DirectX 9.0c compatibility.