Used a single core AMD Athlon64 +3500 with ATI Radion x700 gt 256mb PCI-X card and 2 gigs of RAM, however the game performed sluggishly at medium to low settings. Recently upgraded to AMD dual core X2 +4400 and got dual GeForce 7600gs 512mb video cards, they are bridged/linked. Now the game runs beautifully!!!! Setting are now high to ultra.