Ryzen 5 2600
GTX 1660 6GB
16GB DDR4
Kingston SSD 256GB
With these specs, I was able to run pretty much any game at 1080p.
Games that won't work properly include Borderlands 3, The Elder Scrolls Online, Days Gone, The Forest, while games like Red Dead Redemption 2, Skyrim SE, Horizon Zero Dawn (same developer and studio as Days Gone) work perfectly fine.
I ran FurMark benchmark test using the FullHD preset, 60-65 FPS, no major temperature spike, everything is working as expected. Ran CPU benchmark and the results matched the expected performance for Ryzen 5 2600.
I also checked the performance in task manager while running Borderlands 3, neither CPU or GPU usage went above 30%, nor did any temperature jump, yet I get 7 FPS in the menu and 1-2 FPS in game.
Tried reinstalling graphics drivers using DDU, tried reinstalling chipset.
This is probably a software-related issue, since not all games are impacted. Is there anything else I could try short of reinstalling the whole operating system?