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Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Sun Sep 01, 2019 11:17 pm
by riccetto80
LTolledo wrote:
Mon Aug 26, 2019 2:50 pm
On my RPi4B-4G setup mentioned above,

changing the blue thermal pad to thin copper sheet improved cooling further
idling at 36C, watching YT videos at 40C, maxing at 45C during apt install/update/upgrades CPU at around 80%
interesting i was seeing on aliexpress what case to buy to have good passive and/or active cooling and i see your case.

i found this photo of the passive version:

Image

and the issue there is cpu and ram are too distant to the metal frame, and is impossible to make contact beetwheen the usb3 controller and the case.

can you please tell me how your active version look? i guess under the 2 fans the case have metal, so the active version have metal much closer to the raspberry pi?

sorry for bad english.

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Mon Sep 02, 2019 9:46 am
by gregb49
A most useful thread, thank you all, along with the mass of information at https://www.raspberrypi.org/forums/vie ... 8&t=243500. I'm most impressed with the Pi4, as a desktop replacement but am concerned over the heat issue. I know that the 'experts' say don't worry, but as an Electronic Engineer, I am uncomfortable running CPUs continuously at some of the temperatures recorded in these threads.

I have tried 3 RPi4 cases. Results of my non-scientific trial is as follows:

Image1. The official RPi4 case with a finned heat sink. It ran hot so I placed a small fan inside the case, using the existing ventilation holes. It now runs below 60degC, but is a bit noisy and the fan isn't secured. Works, but not recommended.

Image2. FLIRC. No fan, but a good thermal sink. My Pi ran up to 68deg and the case felt uncomfortably hot to the touch. I concluded that the case had insufficient thermal capacity (for my liking). I added ALDI hardware corner brackets ("ALDI Angle Set 4 piece" 2.99GBP) top and bottom, which although primitive and steel, brought the temp down into the high 40s, low 50s. Image As this is tucked away behind my desk, aesthetics are not important and goes to show how additional thermal capacity, albeit crude, can help.

Image3. Bruphny acrylic case. This included a fan and 3 heat sinks. I consider this the best of the three cases. Nicely made: The instructions are very clear: The fan can be run at 3volt and is almost silent. At the highest, it runs in the high 50s but normally in the 40s.

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Mon Sep 02, 2019 10:14 pm
by LTolledo
The picture of the armor case I've posted was from the amazon site....
below is how it looks now
RPi4B-4G_Armorcase.jpg
RPi4B-4G_Armorcase.jpg (195.05 KiB) Viewed 3661 times

compared to the previous picture I've posted you'll notice that the fans are slightly raised
and the fan's power is not taken from the GPIO headers (this is my standard)
and opening it up.... notice I dont use the "insulator" over the SoC.
RPi4B-4G_Armorcase-open.jpg
RPi4B-4G_Armorcase-open.jpg (200.56 KiB) Viewed 3661 times

with usual desktop use temp usually hover at 37C to 39C,
after watching 20minute 720p video via windowed VLC (seemed CPU intensive) temp rises and hovers at 44C to 45C, then drops to 37C to 39C in less than 15 secs after video end
fan noise measured at 22db measured 30mm above setup

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Tue Sep 03, 2019 1:26 pm
by Thinkcat
I just want to verify: Was there a difference in the height of the chips between versions of Pi 4? Or are all cooling solutions for Pi 4 for 1 GB, 2 GB and 4 GB versions equally?

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Tue Sep 03, 2019 1:48 pm
by dom
Thinkcat wrote:
Tue Sep 03, 2019 1:26 pm
I just want to verify: Was there a difference in the height of the chips between versions of Pi 4? Or are all cooling solutions for Pi 4 for 1 GB, 2 GB and 4 GB versions equally?
No difference in height of sdram chip for 1GB/2GB/4GB.

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Thu Sep 05, 2019 7:16 am
by Konek
Modded to fit heatsink for Pi4 4GB idle at 44C and when stress test 54C at room temp 26C with sysbench . If add a 30x30mm 5v fan will idle at 32C and at stress 37C.

https://drive.google.com/file/d/1-KxHRC ... p=drivesdk

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Thu Sep 05, 2019 12:43 pm
by e-raser
After overclocking the Pi 4 4GB for testing purposes to 1.75 GHz ARM frequency and running stable for a few days I set it to 2.0 GHz.

Stressberry benchmarks will follow in a few days, only notes so far:
- idle temperature with the DLIRC case is about 1 to 3 degrees Celsius higher than with stock clocking (1.5 GHz).
- to compensate the additional overclocking I attached an external USB powered fan and use UHUBCTL to control it dynamically according to the Pi‘s temperature, this works great so far.

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Sun Sep 08, 2019 8:19 pm
by scaramonga
gregb49 wrote:
Mon Sep 02, 2019 9:46 am

Image3. Bruphny acrylic case. This included a fan and 3 heat sinks. I consider this the best of the three cases. Nicely made: The instructions are very clear: The fan can be run at 3volt and is almost silent. At the highest, it runs in the high 50s but normally in the 40s.
Just got this case, seems OK. Sysbench test on an hour loop run showed a MAX temp of 67c, clocked @ 2GHz, and with all the included (4) heatsinks fitted.

The real downside to this case, is the hdmi ports are too close to the case, resulting in the cable not fitting all the way into the socket, so dodgy connection, and a slight move of the unit, causes it to lose connection with the monitor.

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Tue Sep 10, 2019 9:43 am
by ctyldsley
I'd love to see an all metal enclosure, like the Flirc case, with 3 heatsink pillars which is screwed fairly tight to the board. This would allow a thermal pad to be placed on each of the heatsink pillars for optimal heat transfer to the case itself. Then if the case had 2 low powered fans on the top running quiet.

Does such a case exist yet? I feel like this design would easily run at 100% in 2.0ghz for extended periods without any throttling.

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Tue Sep 10, 2019 1:25 pm
by Imperf3kt
ctyldsley wrote:
Tue Sep 10, 2019 9:43 am
I'd love to see an all metal enclosure, like the Flirc case, with 3 heatsink pillars which is screwed fairly tight to the board. This would allow a thermal pad to be placed on each of the heatsink pillars for optimal heat transfer to the case itself. Then if the case had 2 low powered fans on the top running quiet.

Does such a case exist yet? I feel like this design would easily run at 100% in 2.0ghz for extended periods without any throttling.
Reports suggest the Flirc case with no fans can already achieve this.
I cannot try for myself as I have neither Flirc case, nor desire to overclock my Pi4b as its already more powerful than my requirements.

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Wed Sep 11, 2019 1:44 am
by scaramonga
Update on my complaint of the Bruphny case.

Took out 3rd layer from bottom and cut out a section for the HDMI slots, it's very thin plastic, so was easy to do. Now the HDMI cables fit perfectly :) The power 'C' socket can be left as is, as this is slightly higher than the HDMI ones, so the strength of the case is not compromised by leaving this section in place ;)

Great cooling case, will now keep.

BTW...

Fan @ 5v, barely audible.

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Wed Sep 11, 2019 1:17 pm
by ctyldsley
Imperf3kt wrote:
Tue Sep 10, 2019 1:25 pm
ctyldsley wrote:
Tue Sep 10, 2019 9:43 am
I'd love to see an all metal enclosure, like the Flirc case, with 3 heatsink pillars which is screwed fairly tight to the board. This would allow a thermal pad to be placed on each of the heatsink pillars for optimal heat transfer to the case itself. Then if the case had 2 low powered fans on the top running quiet.

Does such a case exist yet? I feel like this design would easily run at 100% in 2.0ghz for extended periods without any throttling.
Reports suggest the Flirc case with no fans can already achieve this.
I cannot try for myself as I have neither Flirc case, nor desire to overclock my Pi4b as its already more powerful than my requirements.
I've not been able to test myself but seeing some benchmarks online I'd seen extended 100% cpu stress tests (when overclocked to 2.0ghz) see the Flirc case to throttle eventually which suggests the level of heat dissipation isn't enough to level out below 80c. Obviously 100% constant extended use isn't likely but it'd be nice to have a case which can comfortably manage that! I'm just not sure if one exists...

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Sat Oct 12, 2019 4:49 pm
by splangie
The Micro Connectors cpu fan is doing it for me, after I drilled a number of holes in the case. CPU is maxing at 68 running cpuburn-a53 test for 20 minutes. I haven't used and of the other tests.

https://www.microcenter.com/product/609 ... spberry-pi

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Sun Oct 13, 2019 12:21 am
by Brad Q
My Flirc case typically idled at 50C in a 75F room. Under full extended(hour) load it never exceed 74C but ran up to 70C in a heartbeat. After a few months I have added a 12V 120mm fan running on 5V. One foot away it is dead quiet(the reason for using 120mm). It now idles at 36C in 75F room and never exceeds 44C. I am still thinking about adding some 10mm(ish) stand offs between the board and the case bottom. In theory that would add air flow and increase the surface area of the case heat sink. It would expose the inside of the case as well as the outside.

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Fri Jan 03, 2020 4:37 pm
by al.lm
Will thermal pads work better with thickness of 1.5 mm than 1 mm (for case in the photo)? Or the board can crack?

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Sat Jan 04, 2020 3:05 am
by LTolledo
al.lm wrote:
Fri Jan 03, 2020 4:37 pm
Will thermal pads work better with thickness of 1.5 mm than 1 mm (for case in the photo)? Or the board can crack?
take measurements on the RPi board's SoC and the heatsink "cover"
you may need a digital caliper to get those measurements.

if the resulting gap between the heatsink and the SoC is 1.2 to 1.3mm then 1.5mm pad will be OK
if the resulting gap between the heatsink and the SoC is 0.7 to 0.8 mm, then 1.0mm pad is better.

Re: Raspberry Pi 4 Heatsink vs Fan vs Flirc Case

Posted: Sat Jan 04, 2020 8:10 am
by Imperf3kt
There's plenty of data around, but today happened to reach well over 40°C, so I did another quick test for the heck of it.

The Flirc case kept the Pi around 65°C under normal load (fullscreen youtube) while no case at all performed identically.

Upon running something silly like cpu burn, the Pi turned the Flirc case into a searing hot tin can of hurt (yes, it burnt me) but still kept it below 80°C for many minutes, whereas no case at all reached beyond 80°C in seconds upon which I immediately switched everything off and gave up trying to burn myself.