Active cooling (just a fan blowing on the Pi, no heatsink) is an order of magnitude better than nothing.Without any cooling assistance, the Pi can get uncomfortably close to the CPU's temperature throttling limit (~80☌), either bare or in a case.The second standout result is a graph comparing all the different cooling options I tested pre-firmware-update: The delta is between 6-8☌, which is quite significant when you're talking about the tiny Raspberry Pi! Active cooling and massive heatsinks make the Pi very happy Here's the graph comparing the Pi in the case before (blue line) and after (green line) the firmware upgrade: but I'd be much more comfortable doing so now that the USB controller is not generating as much heat! I still don't like running CPUs right up to their thermal limits all the time. But after the firmware update, the Pi 4 in an unmodified case might not be so bad. This was what prompted my original blog post on the subject. If you run the Pi 4 in the official Raspberry Pi Foundation's case, unmodified, the CPU would start throttling within a few minutes of any serious activity. Firmware upgrade makes the Pi case usable There are two result sets that stand out the most to me. I first ran all the tests without the updated firmware, using the latest version of Raspbian Lite from the Raspberry Pi foundation's website, then I updated the firmware following the guide in this article from. Upgrading the Raspberry Pi's Bootloader and Firmware The Pi was run headless, only connected to a wired network for control via SSH (WiFi was inactive).The Pi was plugged into an official Raspberry Pi foundation USB-C AC adaptor.I used the exact same Raspberry Pi 4 model B with 4 GB of RAM for every test, with the same microSD card.The test environment was steady 72☏ (22☌), with gentle airflow provided by a fan running on low in the opposite corner of the room.It's also important to list the details of my test environment, and the actual hardware used: Waits another 2 minutes to see how the CPU temperature backs off after the stress test. ![]()
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