Lately one of the POE HATs fan failed and it took a while to source spare parts for repair. In the meantime I noticed that the Raspberry Pi was running stable right below 60°C on full load. Thanks to the 80x80mm fans i had installed in the server rack. So when the everything runs stable why not overclock the Raspberry Pi gently to archive more throughput with crunching BOINC tasks ? I tried that and the last couple of days everything runs fine. So I just used the common settings to run the CPU @1,75 Ghz ( default is 1,5 GHz). I edited some line in /boot/config.txt to archive that:
#uncomment to overclock the arm. 700 MHz is the default. over_voltage=2 arm_freq=1750
After reboot you can check you CPU speed with watch -n 1 vcgencmd measure_clock arm
frequency(48)=1750464896
You need to be aware that the hole Pi and all its components are stressed more than default when overclocking. But i think the heatsinks, the fans on each POE HAT and also the rack fans will keep the stress levels low on the components. Grafana prints the following charts:
CPU temps stay between 50 – 60° Celsius. Actually summer did not yet kicked in here in Germany so I have to continue monitoring CPU temps since I do not have an AC in my homeoffice and things can get much hotter here (depending on outside temp).
I am wondering what impact overclocking will have on monthly statistics. Looking forward to compare numbers.
Btw Power consumption of each Raspberry Pi is now slightly increased with ~7W each. Information about default power consumption can be found here.
