CPU temp Running hot, not recommended

Troubleshooting
1

I’m using DietPi as a base for my PiHole device on a Rpi 3 B+

I recently updated to 7.4.2

I’m now noticing that the CPU temp is Running hot, not recommended ( 60’C : 140’F)

How will you advise to find the root cause of this?

side question, any way to be notify of the increase of temperature on my mac or iDevice?

2

Hi,

You could install a fan to reduce temperature. In general it’s hard to find out what could cause it. Usually it’s CPU usage. You could have a look for running process using htop.

DietPi themselves did not offer any notification system outside the DietPi device.

3

Have you overclocked?

Might also see if you can use cpufrequtils (dietpi-config advanced overclocking) and set to conservative and lower the low speed cpu when idle

For Raspberry Pi 3 Model B+, the PCB technology has been changed to provide better heat dissipation and increased thermal mass. In addition, a soft temperature limit has been introduced, with the goal of maximising the time for which a device can “sprint” before reaching the hard limit at 85°C. When the soft limit is reached, the clock speed is reduced from 1.4GHz to 1.2GHz, and the operating voltage is reduced slightly. This reduces the rate of temperature increase: we trade a short period at 1.4GHz for a longer period at 1.2GHz. By default, the soft limit is 60°C, and this can be changed via the temp_soft_limit setting in config.txt.

4

ok I edited my /boot/config.txt

original:

#-------Overclock-------
temp_limit=75
initial_turbo=20

now:
#-------Overclock-------
temp_soft_limit=60
temp_limit=75
initial_turbo=20

let see if it’s become better

5

by putting
temp_soft_limit=60
you set it to stock


set it to temp_soft_limit=70 and that should fix it

6

dietpi-banner is giving hard coded information regarding colour code and comments. They are displayed according CPU temperature. I guess there is no real deviation if this is fine on this device or not. Best to my knowledge it’s quite generic. Maybe I’m wrong.