@leonardoleonwf Something is limiting your CPU from boosting all the way to 4.3GHz and you have some of threads lower than 2GHz and 15 threads below 3.0GHz !
I know that only one core suppose to boost to 4.3 but the rest shouldn't be far behind.
Your CPU 3900( non X ) boost is 4.3GHz and base is 3.1GHz.
Check power plane advanced settings and make sure that minimum processor state in 100% and also max is 100%.
Even if you have checked previously, double check now.
Disable any ECO mode for your CPU assuming you have capable cooling.
