During a one minute stress test it reached a max of 58°C.

I think it depends on the workload. For xorg use, I‘d definitely recommend a fan or heat sink to avoid throttling. For headless workloads a heat sink is more than adequate.jahboater wrote: ↑Tue Jul 02, 2019 8:33 pmI'm not convinced the Pi4 needs a heat sink most of the time and my Pi4 doesn't seem to throttle, but they do no harm (the passive ones anyway) so I stuck one of these on for fun:
https://thepihut.com/products/al-heat-s ... 30-30-10mm
Its narrower than Pimoroni one mentioned above but heavier and it comes with proper specified 3M-8810 thermal tape. Make sure the fins are aligned vertically.
The tape is important, there have been cases in the past of cheap heat sinks for Pi's with insulating tape!!!!
yes
It will work (was stated in the Pi4 launch blog) and additionally is actually recommended by at least one engineer.
Found this in the A72 manual, if the debug unit has a separate power supply, it could be turned off to save power.Debug powerdownIf the Cortex-A72 processor runs in an environment where debug facilities are not required for any of itscores then you can reduce leakage power by turning off the power to the debug unit in the PCLKDBGdomain.To enable the debug unit in the PCLKDBG domain to be powered down, the implementation must placethe debug unit on a separately controlled power supply. In addition, you must clamp the outputs of thedebug unit to benign values while the debug unit is powered down.To power down the debug PCLKDBG power domain, apply the following sequence:1. Activate the debug output clamps.2. Remove power from the debug PCLKDBG domain.
James, I know the horse has already bolted on this one, and I know it's still relatively early days, but...jamesh wrote: ↑Thu Jun 27, 2019 6:49 pmThe PI4 will run hotter - although its on a smaller process, it has much more powerful ARM cores, plus the HDMI output at 4kp60 adds quite a bit of heat. The ethernet is now on the main SoC also, that is another source of heat that wasn't there before. All in all, more performance requires more power requires more heat output.
We are still looking in to clock improvements to reduce heat load, its amazing how much reducing a clock where possible can reduce the overall temperature, it's a matter of finding settings that mean everything still works.
So, don't use hdmi_enable_4k=1 unless using 4kp60, that can make quite a difference.
I believe that statement is correct. If you put it in a tiny un-ventilated case then that's the fault of the case design or poor choice of case - not the Pi4. (it is a bit sad that the official case seems to fall into that category). Who in their right mind puts a 10-15w device in a credit card sized case with no holes?
Your concern trolling has been noted. If the Pi4 does not fit your use case, don't use it.Exaga wrote: ↑Thu Jul 04, 2019 9:34 amJames, I know the horse has already bolted on this one, and I know it's still relatively early days, but...jamesh wrote: ↑Thu Jun 27, 2019 6:49 pmThe PI4 will run hotter - although its on a smaller process, it has much more powerful ARM cores, plus the HDMI output at 4kp60 adds quite a bit of heat. The ethernet is now on the main SoC also, that is another source of heat that wasn't there before. All in all, more performance requires more power requires more heat output.
We are still looking in to clock improvements to reduce heat load, its amazing how much reducing a clock where possible can reduce the overall temperature, it's a matter of finding settings that mean everything still works.
So, don't use hdmi_enable_4k=1 unless using 4kp60, that can make quite a difference.
In view of what you're written, if RPi engineers are aware that the ARM A-series [Cortex-A72] CPU belongs to the "high-performance group" [and therefore uses quite a bit of power to operate and will generate quite a bit of heat in doing so], and after bench-testing and verifying that the device is suitable for release, and after your field-testers have put the RPi4 through it's paces and declared it suitable for release, and after Eben Upton has been quoted all over the news and media as remarking, "For the first time we provide a PC-like level of performance for most users.", and "No additional cooling will be required for 'light' use." (the latter seems to have vanished from the RPi website - not surprising as it's a little misleading), wasn't there any concerns that the device would not stand up to thermal scrutiny after it was released? I have to ask if the device was tested thoroughly by yourselves (or 3rd parties) prior to being released, and if so, why weren't any of the thermal issues highlighted during that process?
It's a bit of a PR disaster when the bold statements, and claims, and the inticing hype, that's been made about the Raspberry Pi 4 have turned out to be somewhat erroneous.
Very best of luck with your clock improvements. You will certainly struggle to tame the thermal dynamics of the beast you have created.
James,
I use this in /boot/config.txtphil995511 wrote: ↑Thu Jul 04, 2019 10:33 amAs a personal I do not use Wifi or Bluetooth, I can disable them in the OS, but since there is no bios, I can not actually switch off. Would it be possible to boot Noobs on its SD card, to add a command line to physically turn off the Wifi / Bluetooth to hope less consume electricity and therefore less overheat ?
Please note my concern that it is described as a Pi4 case, but the picture appears to have a Pi3 in it!wrn wrote: ↑Thu Jul 04, 2019 10:50 amso I guess I will try one of these heat sink/ enclosure combos when they are available, like the one mentioned by jahboater here : https://www.raspberrypi.org/forums/post ... #pr1491010
The problem with 80C on a metal surface is it can cause severe burns in a very short period of time. We're only talking a second or so.
with one of them mechanical things that spins a cylinder with sharp bits, from ye olde times ?alphanumeric wrote: ↑Thu Jul 04, 2019 1:05 pmA Raspberry shaped / themed cutout in the lid would have helped, hint hint.![]()
The first thing I did when I got the original official case was drill a grid of ventilation holes. I just taped some graph paper on top and drilled where the lines intersected. Then did the same on the bottom. If you take your time it doesn't look too bad when your done.