What's been happening over the last 8 months or so is that my computer's performance during Company of Heroes and other games as continually gotten worse and worse. It still runs the games I play, but just very poorly. My first guess is that my graphics card is dying. Is there a way I can test this? Is there a GPU stress-test? My card is a GeForce 6800XT. I bought it in April 2006, so it is almost 3 years old.