I just started WoW recently and the first time I logged in with my ati radeon 4850, I had amazing performance. No lag, with frames at 60-90 per second. Now a week later, I decided to go back to the place I was previously at when I first started and now I am only getting 30-50 fps. In addition to that, my game occasionally freezes for a couple of seconds, which never happened when I first started. Now the only explanation is the fact that during the week, my computer has been forcibly restarted because it overheated about 3 times. Nowadays I increase my fan speed or leave my case open and it hasn't happened. So did my graphics card get ruined permanently because of this?