seven.7777777s

Here's a screen shot of the load presented to Armbian_5.65_Nanopim4_Ubuntu_bionic_default_4.4.162_desktop where I can run the cores at a higher level than on friendlydesktop-bionic-4.4-arm64-20180921. 

Thanks for the tips  The load is from BOINC with tasks from seti@home
Installing BOINC on Ubuntu
https://boinc.berkeley.edu/wiki/Installing_BOINC_on_Ubuntu
 

I received a Drok Model UM25 tester, and started checking the voltage and amperage used.  I noticed that the NanoPi M4 when running at between 98% and 100% on all 6 cores draws a little over 5.1V and between 1.9A to 2.2A,  This is getting close to the maximum of 5A and 2.5A that the cable, (Anker Powerline+ II USB-C to USB-A 2.0 Cable (3ft)), and power supply, (Anker 60W 10-Port USB Wall Charger), are rated.
I shut down the 7 Raspberry PI 3B + devices also on the power supply and watched the NanoPi M4 use over 5.3V and 2.59A then reboot.
I looked up the specs for the NanoPi M4, it needs 5V 3A
The RaspberryPi 3B+ needs 5V 2.5A, (which is where the power supply and cables I am using are rated)
I ordered a 5V 4A power supply and a cable rated for 4A.
Until they arrive I an running the NanoPi M4 at 1.42GHz and 1.80GHz using the following commands
cpufreq-set -c0 -u1.42GHz
cpufreq-set -c1 -u1.42GHz
cpufreq-set -c2 -u1.42GHz
cpufreq-set -c3 -u1.42GHz
cpufreq-set -c4 -u1.80GHz
cpufreq-set -c5 -u1.80GHz
It is now using 5.2V between 1.61A to 1.82A and does not reboot and the temp is showing 53C