pi3 hot pi2 not

[mrdenmark]

i’ve been running my mirror on a pi3 and the little thermometer was always appearing,i installed mmm-systemstats and the temperature was always in the high 70 to low 80 degree centigrade also,around 5% free ram.
i pulled the sd card and stuck it in a pi 2 and the temp is in the mid 50’s with around 10%free ram
why would this be?i assumed they would be the other way around

[broberg]

The pi3 runs hotter than the pi2 (as the pi4 runs hotter than the pi3), it’ because of higher clocks and there fore more power usage that results in higher temps. The RAM issues I can’t explain however. (My Pi3+ runs at around 45-50C with a heatsink on the cpu.)

The Raspberry Pi 3's average SoC temperature unader load was 61C with a peak of 82C. Meanwhile, the Raspberry Pi 2 had an average temperature of 48.9C and a peak of 59.C

source :
https://www.phoronix.com/scan.php?page=news_item&px=RPi2-vs-RPi3-SoC-Temperature

Another reference :
https://www.martinrowan.co.uk/2019/07/raspberry-pi-4-power-temperature-at-idle/