If you guys are tweaking CO, I strongly recommend testing with a tool like this rather than OOCT/Cinebench:
As I mentionned, CO affects the voltage offset both at the lower end and the higher end of the voltage curve. You need a single core test tool that will alternate between 0% and 100% load on each core to properly test CO stability. An all-core test like OOCT only tests one end of the curve.
BoostTester/BoostTester at master · jedi95/BoostTester
Simple tool for generating loads that should trigger maximum CPU boost clocks. - jedi95/BoostTester
github.com
As I mentionned, CO affects the voltage offset both at the lower end and the higher end of the voltage curve. You need a single core test tool that will alternate between 0% and 100% load on each core to properly test CO stability. An all-core test like OOCT only tests one end of the curve.