Quote (nick_steel @ Dec 31 2017 12:55pm)
You should do "the works". I would try a repaste, use compressed air to blow all the dust out of the heatsink, verify all the fans are working. Make you have the latest drivers, uninstall and reseat the GPU onto the motherboard.
You can probably find a teardown video on YouTube for your specific you ( guide to taking it apart) and buy a thing of thermal paste from Newegg or amazon.