AB350 Cool & Quiet breaks overclock

Yes. It is set to the High Power mode. That is the only change of the various web setting modifications made; did NOT change the high speed interrupt setting nor the SMT to 0.

When a manual overclock is set in BIOS, e.g. 3.8GHz on all cores and 1.35v, and Cool & Quiet option is disabled, the system boots and runs as expected an all utilities show 3.8GHz or just below; 3.795 or the like. Benchmarks return results as expected; CPU-Z Bench Stress multi-core runs around 19500. If the only change made is to enable Cool & Quiet, the system now boots and Ryzen Master shows 2.7GHz in the speed "dial". Windows Task Manager on the Performance tab shows Max CPU speed 3.8GHz, and when under stress Actual Speed just under 2.7; again around 2.695. CPU-Z Bench Stress shows just over 14000 which implies that the numbers are not being reported wrong and the CPU is actually running slower; a lot slower. AIDA64, when stressing, shows 100% utilization, yet task manager shows all CPU threads running only exactly at 80%. This is just bizarre. I would prefer if when idle the CPU would clock down to save CPU life, power, and heat. The same testing with C & Q enabled works fine when core clock is set to auto; 3.0 and 3.2 on all cores max. Everything shows and works normally then; other than running a little slower. It seems to be the combination of C & Q and manual overclock; same 2.7GHz when I tried 3.5 GHz manual overclock.