The processor chip on the video card has many rendering processes inside which create the image on your monitor. It also has memory chips near it, just like your motherboard.
Just be armed with a can of air. Pull the plug on the box and unscrew the cover. 4-6 screws. Mine has eight. Take the cover off and blow all the dust out so you can peek around. Plug the power plug back in with the cover off. Turn the computer back on and make sure all the little fans are working everywhere, and there isn't a bird's nest preventing air flow:):)
It get's better. Just freep mail me:):)
Heh heh - I take mine outside and use a leaf blower. Serious...:-)