This processor performs significantly under typical expectations.
This processor performs significantly under typical expectations.
It seems Ryzen can adjust its clock speeds based on temperature in real time. This feature is controlled through the BIOS. Although I'm not entirely confident about this, it might explain some performance changes. You could try letting your PC sit idle without heavy tasks for a few minutes to let it cool, then restart Cinebench across all cores to observe the initial clock readings.
Please be warned I might not be reachable for the coming hours. If my advice isn't useful, kindly visit yt/your chosen search engine and check if others have resolved this problem or found relevant guides. Best of luck!