About ArmA II

Minimal:
* Windows XP or Vista
* Dual-Core CPU (3 GHz P4, 2 GHz Core2, 3200+ Athlon)
* 1 GB RAM
* 256 MB VRAM
* GeForce 7800 or Radeon 1800 GPU

Recommended:
* Quad Core CPU
* 2 GB RAM
* 512 MB VRAM
* GeForce 8800GT or Radeon 4850 GPU

Firewall/router ports:
* TCP/UDP: 2302 (configurable)