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Too hot to handle? Raspberry Pi 4 fans left wondering if kit should come with a heatsink
Some early adopters of the Raspberry Pi 4, released on 24 June, are running into heat issues, especially with the official Pi 4 case making no provision for a heatsink or fan.
The Raspberry Pi 4 has a 1.5GHz quad-core 64-bit Arm Cortex-A72 CPU, for approximately three times the performance of the previous model. That inevitably generates more heat.
The Pi does not have a heatsink, but uses what the company calls "heat-spreading technology" to use the entire board as a kind of heatsink. This worked fine for the Pi 3, but the official FAQ for Pi 4 notes:
The Raspberry Pi 4 Model B uses the same heat-spreading technology but due to the much more powerful CPU cores is capable of higher peak power consumption than a Model 3B+. Under a continuously heavy processor workload, the Model 4B is more likely to throttle than a Model 3B+.
You can add a heatsink if you wish, and this may prevent thermal throttling by keeping the chips below the throttling temperature.
When the Pi 4 heats up beyond 80°C (176°F), the CPU is throttled to reduce the temperature and a half-full red thermometer appears on the display, if one is connected. If the temperature goes up beyond 85, the GPU, which now supports dual monitors and 4K resolution, will be throttled as well.
It is no surprise that the Pi 4 gets hotter than its predecessor, it is marketed as a viable general-purpose PC, after all.
There is an issue though: if it frequently overheats in normal use, users are not getting full performance. Longevity of the components may also be affected. We advised in our original review that "things got quite warm" when using the Pi for a few days.
(Score: 3, Interesting) by theluggage on Thursday July 25 2019, @01:14PM (3 children)
What nobody seems to be suggesting is just underclock the thing a bit (it's an option in Config.txt, right?) Has anybody tried that?
Seems like a reasonable choice: If you want something that's 3x the speed of the previous Pi, add a fan and/or metal case. If you want it as a tiny, embedded, fanless computer then slightly faster than the old Pi (and, hopefully, much better USB/network performance) is still a win - its not like the price has gone up.
Its worth remembering that the Pi is supposed to be built down to a low price - if you want a premium-priced computer with technical problems to complain about, then raspberries are not the only fruit :-)
(Score: 2) by takyon on Thursday July 25 2019, @01:45PM
I thought about underclocking 100-200 MHz. In particular, -100 MHz is about 7% but could drop temps by a whopping 8 degrees according to one user [raspberrypi.org]. Now I'll have no reason to since I'm getting a shipment of 8 FLIRC cases (most being given away).
[SIG] 10/28/2017: Soylent Upgrade v14 [soylentnews.org]
(Score: 0) by Anonymous Coward on Thursday July 25 2019, @02:37PM
So has someone done this, and what was observed?
My application doesn't need much CPU performance, but IO could be helpful.
(Score: 2, Informative) by Grayson on Thursday July 25 2019, @05:59PM
A large portion of the heat from the device is coming from the USB 3.0 controller, and the USB-C power input.
From the IR shots I've seen of the Pi 4, I doubt that under-clocking it will actually reduce temperatures overall in a significant way.
The biggest issue is still that the stock case has no ventilation at all.