Code: Select all
Raspberry Pi 4 CPU Temperature Monitor Author: Darrell Little http://yatb.devcali.co Date: 07/08/2019 Based on the Raspberry Pi Foundation Project https://projects.raspberrypi.org/en/projects/temperature-log Data logged on AdafruitIO https://io.adafruit.com/dlittle55/dashboards/my-rpi4-dashboard
Die shrinkage already happened with the Pi 4, but it has a lot more stuff in it than previous models.
The 1 and 2 didn't have Wireless or Bluetooth unless you used USB adaptors.While the Zero was too slow for many, and the 1, 2, and 3 had an issue of Bluetooth keyboard getting interference with the Wireless signal,
All of my Pi 3Bs run just fine in the official case with a small heatsink.The only pis that can run without cooling fin, are the zero, 1 and 2.
The Pi 3 can run with a cooling fin, as long as it's not in a case.
How about none? Official case with the lid off works for me.The 3B+ needs either a large heatsink, or a small active one.
How about none? Official case with the lid off works for me.
In a fully closed case a fan or heatsink is mostly pointless because the heat has nowhere to go.
I'd say, a fan is critical if you're running more than 50% constant CPU load.
The ideal case is similar to a PC Case:
Thank you ProDigit, this is exactly the info I was looking for, in order to understand what to expect.ProDigit wrote: ↑Tue Aug 27, 2019 7:54 amI'd say, a fan is critical if you're running more than 50% constant CPU load.
Passive heat sinks are good if the only CPU load will be program loading, or occasional bursts, but the pi remains mostly passive.
When coding the 3B+ I have, idles around 50c with the large heat sink, which is still ok.
With an open case, around 40c
With an active cooling it should hit close to 30c.
Thank you, going to read itfruitoftheloom wrote: ↑Tue Aug 27, 2019 8:18 amhttps://www.tomshardware.co.uk/raspberr ... 61071.html
If you are waiting for a Pi5, you are in for a VERY long wait.
jamesh wrote: ↑Tue Aug 27, 2019 8:36 amThere is a lot of misinformation in this thread. So let set some things straight.
- A Pi (any model) without any sort of cooling will not fail through 'overheating'. It will simple throttle itself to cool itself down if it get too hot. This mean that cooling solutions are not 'critical'.
They might be critical for a program to work or not. If the Pi doesn't offer the same performance at 70C as it does at 50C, I would say that cooling is integral and absolutely necessary. For most people who are running the 3B+ or 4B in a case, they all will experience CPU throttling; and all will benefit from a heatsink
- If a Pi goes over a preset limit, it will automatically slow down
- If you are running intensive applications all the time, a cooling solution will help with performance.
- If you are using an enclosed case, there is nowhere for the heat to go, EVEN with a heatsink. So they will run hotter in an enclosed case.
A (large) heat sink will dissipate the heat better. The heat will radiate much more through the plastic. My Pi 3B+ plastic casing feels cold to the touch with a small heat sink, but feels warm with a large heat sink (one that covers nearly the entire board).
There's more dissipation of heat, so heat gets extracted better. Also, a large heat sink can act as a buffer. if loading programs takes 1 to 2 minutes, a large heat sink can prevent the CPU to reach throttling temperatures, while a small one might start throttling earlier. A large heat sink does need more time to cool down after that, where as a small heat sink cools a lot faster after a CPU load is finished.
- Heatsinks in an open case work well
- Use a fan shim or similar for best cooling, if in a case ensure there are vent holes.
- The Pi4 is already on a smaller process than previous models.
Though nothing compared to a 'modern' $45-$65 cellphone, using 14 nm lithography. More is possible, and not that expensive in today's terms. Though if in the future the Pi will have a 14nm design, I would hope it'll get something more like a 6-8 core 1,75Ghz CPU. The frequency and responsiveness for a Linux GUI at 1,5-1,6Ghz is quite good. More power can be distributed to more cores. It'll also allow the CPU to remain cooler when running the same load through the same amount of cores as current Pi4.
- The FLIRC case works well but the case itself does get hot. A very good passive cooling solution.
- My P4s runs on my desk, no case, rarely overheats, if ever.
There's the case of overheating (going past 85C) and thermal throttling (60-70C on the Pi3B+). While you could go by with a Pi 3B throttling at 1.2 Ghz, some prefer to have maximum performance at all times.
- Most desktop uses of a Pi rarely use, on average, more than about 25% of CPU. Some video will bump that, as will big compiles etc.
- If you are waiting for a Pi5, you are in for a VERY long wait.
Yes, I'm expecting a 4B+ first.