System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 770/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.38

Blender Version
Broken: version: 2.90.0, branch: master, commit date: 2020-08-31 11:26, hash: rB0330d1af29c0
Worked: (newest version of Blender that worked as expected)

Short description of error
Blender closes in a fewminutes on very simple scenes, even the default cube, when on rendered viewport in cycles set to CPU rendering mode.
When i check my task manager, i can see a sudden spike at 100% on my gpu, when it was pretty stable at 20% most of the time.
I tried to reinstall blender and use default settings.