Hey I had the same problem. I have the same pc but with the cheaper 1660ti gpu. My processor was constantly overclocking the heck out of one core for no reason, I lowered it's power availability to 90% in the following way, and this fixed my issues, albeit, my computer is a little slower because it cant overclock itself anymore. Press Win + R to launch the Run command box. Type Control Panel in the text input area and hit the enter key.
- Control Panel will launch. Find and click on the Power Options feature.
- Click on the Change plan settings option located next to the active power plan of your system.
- Then click on the Change advanced power settings. A new Power Options window will launch.
- Find and expand the Processor Power Management option. Click on the Maximum processor state option and edit the values. It will be 100 percent by default.
- Also you will have to lower the Minimum processor state. I lowered them both to 90% but you could do 95% to see if that works for you.