UT2004 plays ok on my p3 1ghz, 512mb pc133 and ti4200, I think thats a bit poopyier than ya bro`s rig!
no real difference in performance between 800x600 and 1024x768 really!
I used to have a hercules 3dprophet 4000xt in the rig(no pixel or vert shapers!), I could play LANed up to the rig in my sig!!