Halo 2

2.0 gigahertz (GHz)
1 gigabyte (G or random access memory (RAM)
7 GB of available hard disk space. The dedicated server and the map editor require more hard disk space.
ATI X700 or Nvidia 6100 display adapter with 128 megabytes (M of RAM and the Pixel shader: 2 or higher
Vertex shader: 2 or higher
Graphics score: 3 or higher
Gaming graphic score: 3 or higher
32x speed
Sound card, speakers, or headset
Keyboard and mouse or compatible game controller (Xbox 360 Controller for Windows)
Network adapter for LAN multiplayer gameplay
Broadband Internet access for Windows Live multiplayer gameplay

CPU: AMD athlon 2600 @ 2 ghz
Ram: 1gig
VGA: nvidia geforce 6600GT 256mb( AGP )
Hard disk: Halo 2 takes about 4 GB*
Operating system: VİSTA