I played the COD4 demo awhile back on my last system with 2GB of RAM, an 8800GTX, a creative sound card and an X6800 processor (core clock). It seemed to run ok, but the tearing was awful and when I turned on vsync, it was an awful mess. The game maintained 60fps according to fraps AND its in game meter, but what I was actually seeing was what looked like slowdown, skipping and who knows what. I chalked it up to drivers or maybe my computer which I was having second thoughts about. Now on my new rig, the problem with vsync enabled remains and the game is quite frankly ugly to play with vsync on or off. With it off its a B%$ch to aim and with it on its impossible to turn or maneuver smoothly. But with that last word, I thought about something. I mapped the turn left and turn right keys to my keyboard and stopped using the mouse. For the most part, the problem went completely away. I unplugged my logitech mouse and inserted a Dell one, but it made no change. I also enabled smooth mouse, but some juddering/stuttering remained. These were both Dell XPS systems with the latest drivers, what is going on here?