the Pi 400 is the first Pi I'm able to reliably run at more than 2.147 GHz. The bottom was very slightly warm, and the ports on the back were warm to the touch, but not even close to the painful 'ouch' I would get touching some parts on the Pi 4 under load! Overclocking to 2.2 GHz The maximum temperature it reached was 52☌, though the surface of the keyboard never went above 31☌: I kicked off stress-ng to load up all the four CPU cores on the Pi, and let it run for 30 minutes at the default 1.8 GHz clock on the Pi 400: sudo apt install -y stress-ng # if it's not already installedĪnd here's a graph of the temperature over 30 minutes: Plastic isn't the best thermal conductor, and later I found that most of the heat output goes through the ports in the back and the vent on the bottom.Īnd then I started dumping temperature data into a CSV file with the command: while : do echo `date +"%Y-%m-%d %T"`','`vcgencmd measure_temp | tail -c +6 | sed "s/'C//g"` > temperatures.csv sleep 1 done I took a thermal image of the board before running any tests:Īt idle, the exterior of the keyboard is indistinguishable from the environment around it. I wanted to see if there's any level at which the CPU gets near throttling, so I set up a test scenario and started measuring temperatures, both internally and with my Seek IR camera. To learn more about Pi-Apps, read the documentation and the wiki.A few other reviewers did some tests (like Explaining Computers) and found the Pi 400 was able to stay cooler than a Pi 4 inside a Flirc passive heat sink case, but was not quite as cool as a Pi 4 running with an ICE cooling tower. It helps Pi-Apps developers test upcoming apps for reliability on a variety of systems.
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