Heated NVIDIA GTX 760 2GB (MSI)

The problem is this, the video card 3 years, everything worked like clockwork, a month ago the artifacts, then began to fade the screen and stop spinning the cooler on the graphics Card used that cooler on the CPU spinning like crazy. Under load the Temperature of 70-81 degrees. In the normal state 35. The screen goes off only at a high load on the graphics Card, for example, when playing PUBG. When playing the game weaker, everything goes well. The system unit has 2 cooler + 1 on the video card. Changed thermal paste and cleaned the dust, did not help set the cooler speed to 100%, to no avail. I think the problem with the voltage, but I don't know what value it should be. Chasing a video card stress tests very quickly gaining temperature, Furnace was 87 degrees. Who knows what can help? Recently changed the PSU to 700 Cotton, enough power 100%.