On a sunny day (Tue, 15 Aug 2023 17:50:49 +0200) it happened Marco Moock <mo01@posteo.de> wrote in <ubg6sp$2smhc$1@dont-email.me>:

Hallo!

There are many passive cooling housings available for the Pi4B.
Does anybody here have experience with them?

Does it also work properly in the summer with 35°C?

I have a Pi4 8 GB with passive cooling (used to post this)
Room is 27 C, raspi is 71 to 72 C when not doing much.
Original Raspi housing.
I think the thing will trottle CPU speed at some point if it gets too hot. There are little heatsinks mounted on the processor and 2 other chips

I also do have a Pi4 4 GB in an alu housing with fan, that housing inhibits any WiFi, but it is way cooler,
even under heavy load.
I think having a fan is better.

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Hallo!

There are many passive cooling housings available for the Pi4B.
Does anybody here have experience with them?

Does it also work properly in the summer with 35°C?

--
kind regards
Marco

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Marco Moock wrote:

There are many passive cooling housings available for the Pi4B.
Does anybody here have experience with them?

Sure, I have the passive Flirc full body aluminum case, it works
wonderfully with the 4B, usually the temperature is below 60�C.

Does it also work properly in the summer with 35�C?

While I haven't had 35�C in my living room because I leave the sliding
door into the garden open at night, so max. was ~27�C on the hottest
days around here I wouldn't expect the 4B to overheat at 35�C,
especially since it goes into throttling only at around 90�C, which I am
quite sure will never be reached with this case.

-jw-

--

And now for something completely different...

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On 15/08/2023 16:50, Marco Moock wrote:

Hallo!

There are many passive cooling housings available for the Pi4B.
Does anybody here have experience with them?

Does it also work properly in the summer with 35°C?

I've got a GeekWorm Aluminum Case.

<https://www.amazon.co.uk/dp/B07ZVJDRF3>

Room Temp 23 C
Ri Pi Temp 60 C
Case External Temp 43 C

The quoted Pi throttle temp is 85 C

Pi workload = top reporting %Cpu(s): 55.0%, (viewing CCTV camera).

So I reckon it could take and extra 12C room temp.

I also have a little, 8cm, USB desk fan, I use for shifting heat from my compute cupboard on a hot day. If I'm worried, I can put the case in
front of that. Today, within 5 minutes, fan on slow, it dropped the cpu
temp 15 to 45C.

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Am 15.08.2023 um 16:01:53 Uhr schrieb Jan Panteltje:

I have a Pi4 8 GB with passive cooling (used to post this)
Room is 27 C, raspi is 71 to 72 C when not doing much.

What happens if you stress the CPU?

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On 8/15/23 17:58, Marco Moock wrote:

Am 15.08.2023 um 16:01:53 Uhr schrieb Jan Panteltje:

I have a Pi4 8 GB with passive cooling (used to post this)
Room is 27 C, raspi is 71 to 72 C when not doing much.

What happens if you stress the CPU?

In my case, stress-ng --cpu 8 took the cpu temp up to a max of 70C after
45 minutes, at which time it plateaued.

That was without putting the case in an external airflow. With the case
in a strong external airflow, the cpu temp went down to 50C, after just
10 minutes.

I assume you don't live at 35C without some kind of fan?

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On a sunny day (Tue, 15 Aug 2023 18:58:02 +0200) it happened Marco Moock <mo01@posteo.de> wrote in <ubgaqq$2tdod$1@dont-email.me>:

Am 15.08.2023 um 16:01:53 Uhr schrieb Jan Panteltje:

I have a Pi4 8 GB with passive cooling (used to post this)
Room is 27 C, raspi is 71 to 72 C when not doing much.

What happens if you stress the CPU?

OK, I types 'yes' in a rxvt terminal in X
Now its 23.7 C early in the morning
and the raspi goes to 83.7 C and throtles there....
xosview shows only 1 CPU at 100% and a load factor of 4

raspberrypi: ~ # vcgencmd measure_temp
temp=83.7'C

raspberrypi: ~ # vcgencmd get_throttled
throttled=0xf0008

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On 15/08/2023 16:50, Marco Moock wrote:

There are many passive cooling housings available for the Pi4B.
Does anybody here have experience with them?

Does it also work properly in the summer with 35°C?

Marco,

I have a number of RPi 4 and not had a problem with them, but my maximum room temperature has been just 29°C. None are being stress with CPU load. Keep them out of the sun!

The best "housing" I've fund so far has been the Raspberry Pi 400 - the RPi built into a keyboard.

--
Cheers,
David
Web: https://www.satsignal.eu

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On 15/08/2023 17:01, Jan Panteltje wrote:

On a sunny day (Tue, 15 Aug 2023 17:50:49 +0200) it happened Marco Moock <mo01@posteo.de> wrote in <ubg6sp$2smhc$1@dont-email.me>:

Hallo!

There are many passive cooling housings available for the Pi4B.
Does anybody here have experience with them?

Does it also work properly in the summer with 35°C?

I have a Pi4 8 GB with passive cooling (used to post this)
Room is 27 C, raspi is 71 to 72 C when not doing much.
Original Raspi housing.
I think the thing will trottle CPU speed at some point if it gets too hot. There are little heatsinks mounted on the processor and 2 other chips

I also do have a Pi4 4 GB in an alu housing with fan, that housing inhibits any WiFi, but it is way cooler,
even under heavy load.
I think having a fan is better.

My experience with cooling electronics is that as long as air can get in
and out, and the air isn't much above 40°C and your kit can handle
internal temps of 100°C, you just need a ventilated housing. Or some big
fins and a heatsink.

Fans enable you to get about 3-5 times the cooling that convection alone
will net you. But take power and make noise.

Experience shows that it is extremely difficult to predict thermal
performance theoretically, as how the equipment is installed plays a
huge part.
My advice is suck it and see. If your CPU cores are over 100°C, then its
time to probably do something.


--
“I know that most men, including those at ease with problems of the greatest complexity, can seldom accept even the simplest and most
obvious truth if it be such as would oblige them to admit the falsity of conclusions which they have delighted in explaining to colleagues, which
they have proudly taught to others, and which they have woven, thread by thread, into the fabric of their lives.”

― Leo Tolstoy

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Am 16.08.2023 um 00:21:08 Uhr schrieb Pancho:

On 8/15/23 17:58, Marco Moock wrote:

Am 15.08.2023 um 16:01:53 Uhr schrieb Jan Panteltje:

I have a Pi4 8 GB with passive cooling (used to post this)
Room is 27 C, raspi is 71 to 72 C when not doing much.

What happens if you stress the CPU?

In my case, stress-ng --cpu 8 took the cpu temp up to a max of 70C
after 45 minutes, at which time it plateaued.

That was without putting the case in an external airflow. With the
case in a strong external airflow, the cpu temp went down to 50C,
after just 10 minutes.

I assume you don't live at 35C without some kind of fan?

True, but I will ask that to have a buffer.

I will look for a metal housing that has a connection to the CPU, so
the heat can spread to the entire housing.

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Marco Moock wrote:

I will look for a metal housing that has a connection to the CPU, so
the heat can spread to the entire housing.

This is what the Flirc case has, the entire case gets kind of lukewarm
when the Pi has to do some work.

-jw-

--

And now for something completely different...

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On 2023-08-15 18:35, Joerg Walther wrote:

Marco Moock wrote:

Sure, I have the passive Flirc full body aluminum case, it works
wonderfully with the 4B, usually the temperature is below 60°C.

I also have a Flirc, in a 2 m2 closet.
it never reaches above 55 degrees summer or winter

--
/Björn

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On 16/08/2023 12:35, Marco Moock wrote:

Am 16.08.2023 um 00:21:08 Uhr schrieb Pancho:

On 8/15/23 17:58, Marco Moock wrote:

Am 15.08.2023 um 16:01:53 Uhr schrieb Jan Panteltje:

I have a Pi4 8 GB with passive cooling (used to post this)
Room is 27 C, raspi is 71 to 72 C when not doing much.

What happens if you stress the CPU?

In my case, stress-ng --cpu 8 took the cpu temp up to a max of 70C
after 45 minutes, at which time it plateaued.

That was without putting the case in an external airflow. With the
case in a strong external airflow, the cpu temp went down to 50C,
after just 10 minutes.

I assume you don't live at 35C without some kind of fan?

True, but I will ask that to have a buffer.

I will look for a metal housing that has a connection to the CPU, so
the heat can spread to the entire housing.

That works, but beware, still put vents in it for hot air to leak out

--
Climate Change: Socialism wearing a lab coat.

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The Natural Philosopher wrote:

I will look for a metal housing that has a connection to the CPU, so
the heat can spread to the entire housing.

That works, but beware, still put vents in it for hot air to leak out

That is not possible, since the case is full body aluminum, there is
simply not a space for more than the RPi4, and, as the others who have
the same or a similar case stated, it is not necessary.

-jw-

--

And now for something completely different...

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