Main thing about game servers is they are much more different than data servers or file servers. For game servers, the main thing is to have enough RAM. I would suggest 2 GB for very smooth operation. The CPU should be decent, but you don't need anything extreme, like quad core or something like that, but at least get dual core. Ace is right about the video, you don't need anything besides onboard because you won't actually be playing the game. A Seagate 7200.10 or WD raptor should offer quick map loading, and try to find a gigabit LAN either onboard or an add on card.