The machine I saw it on is a Dual 2.something with a one gen behind card... guys not at his desk right now so I don't know the exact model, but it's one of the newer FX line. He was running on default settings (medium) at 640x480 and was still getting chugs everytime you'd enter a new room. Highest we tried was High at 800x600. Pretty unplayable. Others are reporting similar results on slightly better machines.