Try limit your FPS via the nVidia control panal, if your FPS is unlimited it will cause heat issues.
The basic limit would be at your monitors refresh rate, like mine is 75 mhz so I limit my FPS to 75.
If you dont know your monitors refresh rate, just set your FPS to 60 then up it until you get heat issues.

I run the game at about 60 - 75 FPS with an 1070 gpu.