Minimum: 3D hardware accelerator card required - 100% DirectX 9.0c compatible 64MB hardware accelerator video card and the latest drivers*, Microsoft Windows 2000/XP, Pentium IV 1.4GHz or AMD Athlon XP 1700+ processor or higher, 256MB RAM (512MB RAM recommended), 100% DirectX 9.0c compatible 16-bit sound card and latest drivers, 100% Windows 2000/XP compatible mouse, keyboard and latest drivers, 4.0GB of uncompressed free hard disk space (plus 600MB for Windows 2000/XP swap file)
Multi-player Requirements:

Internet (TCP/IP) and LAN (TCP/IP) play supported
Internet play requires broadband connection and latest drivers
LAN play requires network interface card and latest drivers

Important Notice: *Some 3D accelerator cards with the chipset listed here may not be compatible with the 3D acceleration features utilized by Call of Duty. Please refer to your hardware manufacturer for 100% DirectX 9.0c compatibility.
Supported Chipsets

ATI Radeon 8500
ATI Radeon 9000
ATI Radeon 9200
ATI Radeon 9500
ATI Radeon 9600
ATI Radeon 9700
ATI Radeon 9800
ATI Radeon X300
ATI Radeon X550
ATI Radeon X600
ATI Radeon X700
ATI Radeon X800
ATI Radeon X850
nVidia GeForce 2 Ultra
All nVidia GeForce 3/Ti Series
All nVidia GeForce 4/Ti Series
All nVidia GeForce FX Series
All nVidia GeForce 6 Series
Recommend nVidia GeForce 7 Series or higher

PlayStation2