depends on your settings, and the fact that its very un optimized now, it will run much much faster on all cards when its done, In fact, when its done, ill be running at a medium settings at 800X600 on my 9000 pro at over 30 fps. Thats an estimate, but your 9600 pro is about the same in performance as a 9500 in some things, but the 9600 pro will excell in this game over the 9500 pro quite well, for this game useds gpu power more then any other part of the card, and your gpu is much faster then a 9500 pro, no need to overclock, I will guess, that with a decent system, you could run doom 3 at 1024X768 highest settings, at maybe 40 fps, but dont us anti aliasing, or AF.