If you set it manually to that frequency, you underclocked it.
Your base speed is 3.6GHz, boost is 4.2GHz, by setting it to 3.9GHz you limited the speeds lower than it could reach on its own.
Anything under 4.2GHz is underclocking.
I seriously doubt you'd ever be able to OC to 4.5GHz without some sub zero cooling. With Ryzen all core OC limit is practically at its boost clocks.If I change to 4.5ghz this would be overclocking ? Not a good idea on a stock cooler though is it ?
I seriously doubt you'd ever be able to OC to 4.5GHz without some sub zero cooling. With Ryzen all core OC limit is practically at its boost clocks.
Edit.
Yes, boost stops as soon as you set frequency manually and it also stays at that frequency even when in idle state.
RAM overclocking is beneficial for ryzen but it is a tad more complicated then overclocking a cpu. If you just raise the mhz and leave the timings on auto it might be your bios responds to your "overclock" with timings so lose, that your performance goes down in the end.What about RAM then ? I'm happy to OC that a bit. I changed the freq from 2400mhz to 3000mhz