Originally posted by RasaNova:

Generally if somebody's hardware is overheating, that indicates a PC issue. A GPU should be able to run fine at 100%, if it's not then there may be a cooling issue, or dust, or overclock settings, or bitcoin mining, or a number of other things that are not the game.

This. A properly build and maintained PC at room temperature can run all processes at 100% indefinitely without overheating.