I just upgraded some parts in my system (look at sig for the list). The main things that affect the playing in source, that I can think of, is the sound card and the vid card. I can actually use 1600.1200 resolution which is great and still get around 100fps with no AA/AF on. But when I shoot, no matter what gun I hear the shot and then an echo after it. It is so annoying to the point where I can't understand when I am actually shooting and it is hurting my game play. I am using the 83.91 forceware drivers and the drivers that came with the sound card. Any ideas would be great!