And the heat can make its way over to the microSD card, possibly reducing its stability or longevity. The board still gets noticeably hot-enough so that a finger touching the wrong part could burn you (though you shouldn't pick up a running Pi with your greasy oily hands!). Towards the end of a stress test, it throttled for a few times, but only for a brief moment each time.
Since there's no case constraining air flow, natural convection carries away enough waste heat from the CPU and other hot parts of the board to keep it from throttling-at least most of the time. It's silent when you don't have a fan attached, and best of all, this is how it comes out of the box. The barren Raspberry Pi is useful when you're building a new project, playing with GPIO pins, or testing a new Raspberry Pi setup.
The Pi was plugged into an official Pi Foundation USB-C AC adapter (except in the case of the PoE test).īest for: Tinkering or testing new things.The Pi is running the latest firmware/bootloader which fixes the USB controller's energy usage.Every test was performed on the same 4 GB Pi 4 model B, using the same 32GB Samsung Evo+ microSD card updated to the latest Raspbian OS revision.I used this CPU stress temperature monitoring script.I'll go through each of the Pi cooling setups in detail through the rest of this post. (Click on the name of any option to go to the detailed results for that cooling method.)Īnd here's a graph of the actual temperatures for each cooling method through a 20 minute run of the stress test (5 minutes idle, 10 minutes under stress, then 5 minutes idle): Well, here goes-in table form, here are the maximum and minimum temperatures for each cooling method: Cooling Option Each approach has its benefits and drawbacks, which I'll highlight along with the raw temperature data from stress tests. So today I'm going to remedy that by writing the most complete guide I know of for options for cooling your Raspberry Pi. I've written about how the Raspberry Pi 4 needs a fan, and more recently how it might not.īut I realized, I've done a lot of testing for my own needs, but never compiled them into one concise post. The 3 model B+ was the first generation that had me concerned more about cooling (the CPU gets hot!), and the Pi 4's slightly increased performance made that problem even more apparent, as most of my heavier projects resulted in CPU throttling. I've used every model through the years, and am currently using a mix of A+, 2 model B, and 4 model B Pis. From home temperature monitoring to a Kubernetes cluster hosting a live Drupal website, I have a lot of experience running Raspberry Pis.
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