Raspberry Pi Zero 2 W: slides and thermals

line graph of cpu temperature against time. Temperature rises very slowly, reach 70 degrees C in 40 minutes and then only rising very slightly to about 73 degrees C in the entire run time of 3 hours 20 minutes
2 out of 4 cores burning, 32-bit mode: time to overheat = basically never

Slides from last night’s talk:

It’s impossible to have a Raspberry Pi Zero overheat unless you overclock it. That’s why you don’t get any cases for it with fans or heat sinks. The quad-core Raspberry Pi Zero 2 W, though, has the potential to do so. Here are some numbers:

  • Used official case with lid fitted: increases SoC temperature +3 °C over free air
  • Test – CPUBurn: https://github.com/pmylund/cpuburn
  • Tested 4, 3 and 2 cores burning in 32-bit and 64-bit modes: time from idle to throttling (80 °C) measured
  • GPU overheat not tested.
line graph of cpu temperature against time. Temperature rises sharply from about 47 degrees C to 82 degrees C in around four minutes
All 4 cores burning, 64-bit mode: time to overheat = under 3½ minutes
line graph of cpu temperature against time. Temperature rises sharply from about 47 degrees C to 82 degrees C in just over four minutes
All 4 cores burning, 32-bit mode: time to overheat = just over 4 minutes
line graph of cpu temperature against time. Temperature rises moderately from about 47 degrees C to 81 degrees C in around seven minutes
3 out of 4 cores burning, 64-bit mode: time to overheat = just over 7 minutes
line graph of cpu temperature against time. Temperature rises slowly from about 47 degrees C to 81 degrees C in around ten minutes
3 out of 4 cores burning, 32-bit mode: time to overheat = 9½ minutes
line graph of cpu temperature against time. Temperature rises very slowly, reach 70 degrees C in 40 minutes and then only rising very slightly to about 73 degrees C in the entire run time of 3 hours 20 minutes
2 out of 4 cores burning, 32-bit mode: time to overheat = basically never

Unless you’re doing things that might indicate you should be using a bigger computer, a Raspberry Pi Zero 2 W won’t overheat and doesn’t need any form of cooling. If you’re overclocking, well … it’s your choice to have cooling equipment worth more than the computer it’s trying to cool.

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