For the sake of it, reset the bios and load optimised default, reboot and retest.
Also did you run the vantage?
It would be really helpful if you can and post your scores. If CPU is choking up due to some reason, it will show up in CPU score.
If thats fine, we can rule it out and look elsewhere.
If you used MSI overclocking tool, relaunch it and hit reset ( this tool tends to reapply previous settings which might not have worked ). Also hit the Defaults tab in CCC Overdrive tab and rerun the benchies / games.
This is where running synthetic benchmarks really helps.