i have a very low frame rate when running tf2. i get 20 or less frame in the game, and i usually runs at 10, and it's the same problem with other orange box game. i've tried turn everything low or off but it seems does nothing to improve the performance.i have a celeron d 2.66G+1G DDR 400*2+X800XT+280w psu. Some gut say they run the game fine just with a P4 cpu+ati 9800pro +768 Ram. what can i do? is it a psu issue, or the cpu?