I just ran the program and prime. Set the filter at 80%. It reported one spurious looking 16.670 as minimum. Looking at the log file, mostly 21 but many 20.3/5/7/8 as well. So, throttling happened. Max core temp in realtemp was 87C. Don't know the tcase because hwmon wasn't running.

Why would we see a min multi of 16.670 when the cores were all loaded for all the time during 11 mins?