APPLY NEW THERMAL PASTE OR GET A NEW VGA COOLER!!!!! Why the fcuk are you even asking? the stock coolers on the newest highend cards are Absolute BULLshit. also they usually use toothpaste as the compound, or worst case scenario no paste at all!!
no but SERIOSULY you need to get a new VGA (Graphics card heatsink with a fan or two) cooler. id recommend this: http://www.arctic.ac/en/p/cooling/vga/18/accelero-xtreme-plus.html?c=2182
OR if you havent got 50 bucks, get a new thermal paste!!
Coolaboratory Liquid prohttp://www.coollaboratory.com/en/products/liquid-pro
around 8 times better cooling that most high end thermal pastes (no ***)
[ must N O T be installed on Aluminium Heatsinks ]
Get AS5 paste, or ANY AC MX-1 or any of those good pastes, which are cheap and good!