Just in case you have not heard of it, Unreal Tournament 3 Demo is out. You can get it at FilePlanet or 3D Gamers or of course your friendly neighbourhood torrent sites. The size of the demo is around 741MB.
I tried to play it on my P4 3.2GHz with ATI X800 XT and it crawls even with a resolution of 800×600 and lowest settings.
I NEED MY QUAD CORE COMPUTER NOW!