You can install software to check on the temperature of your CPU and video card to ease your paranoia :) Most of these programs can even start beeping loudly if

You can install software to check on the temperature of your CPU and video card to ease your paranoia :) Most of these programs can even start beeping loudly if you are getting close to overheating the hardware. That said, high-power modern video cards work at ridiculous temperatures, around 95C. That's almost enough to boil water, and yet is considered acceptable. Any modern CPU will shut off if overheated. Anyway, you will probably have to replace your video card due to obsolescence rather than thermal damage.