ejolson
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Re: Heat torture testing Pi4

Wed Feb 12, 2020 3:34 pm

ganzgustav22 wrote:
Wed Feb 12, 2020 3:24 pm
Now at 60.5C ambient, 142C CPU and 151.7C PMIC it just rebooted on it's own. Still working fine after the reboot.
Do you have any idea whether other Pi 4B computers--same model but from a different manufacturing batch--would perform at similar temperatures?

ganzgustav22
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Re: Heat torture testing Pi4

Wed Feb 12, 2020 3:51 pm

ejolson: No, have only tried this one so far. It was bought around October 2019.

jamesh: In case you need this info for debugging:

cat /etc/rpi-issue output:

Code: Select all

Raspberry Pi reference 2019-09-26
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 80d486687ea77d31fc3fc13cf3a2f8b464e129be, stage2

uname -a output:

Code: Select all

Linux ms-presenter-8f60a20b 4.19.93-v7l+ #1290 SMP Fri Jan 10 16:45:11 GMT 2020 armv7l GNU/Linux

rpi-eeprom-update output:

Code: Select all

BCM2711 detected
BOOTLOADER: up-to-date
CURRENT: Tue 10 Sep 10:41:50 UTC 2019 (1568112110)
 LATEST: Tue 10 Sep 10:41:50 UTC 2019 (1568112110)
VL805: up-to-date
CURRENT: 000137ad
 LATEST: 000137ad

vcgencmd version output:

Code: Select all

Jan 10 2020 16:52:04
Copyright (c) 2012 Broadcom
version fdb5c37e330e7cb3027ac4fcc5b1cd5f244b351f (clean) (release) (start)

jamesh
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Re: Heat torture testing Pi4

Wed Feb 12, 2020 4:16 pm

OK, so that is pre DVFS firmware I think.

Might be worth doing an

sudo apt update
sudo apt full-upgrade

to get the latest code. Should have today's fixes in as well, so should work on all devices.
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rhildinger
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Re: Heat torture testing Pi4

Wed Feb 12, 2020 5:39 pm

ganzgustav22 wrote:
Wed Feb 12, 2020 3:24 pm
Now at 60.5C ambient, 142C CPU and 151.7C PMIC it just rebooted on it's own. Still working fine after the reboot.
151.7C? You're creeping up on the melting point of solder. I'm surprised you haven't had some sort of permanent hardware failure at that temp...

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rpdom
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Re: Heat torture testing Pi4

Wed Feb 12, 2020 5:54 pm

rhildinger wrote:
Wed Feb 12, 2020 5:39 pm
151.7C? You're creeping up on the melting point of solder. I'm surprised you haven't had some sort of permanent hardware failure at that temp...
A long way off yet. The Pi has lead-free solder which doesn't start to melt until around 220°C at minimum for the really low temperature versions and maybe 100°C higher then that for others.
Unreadable squiggle

jamesh
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Re: Heat torture testing Pi4

Wed Feb 12, 2020 9:16 pm

We've made some attempt to replicate this - I cannot get my PI4 to go above 75 with 100% CPU and other testers see the clock drop down once they get to 85, so the fact this one is NOT dropping is weird! Will probably try a bit harder tomorrow, but to my eyes there is clearly something wrong somewhere.
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rpdom
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Re: Heat torture testing Pi4

Wed Feb 12, 2020 9:20 pm

Non-standard frequency scaling governor setting?
Unreadable squiggle

jamesh
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Re: Heat torture testing Pi4

Wed Feb 12, 2020 9:33 pm

rpdom wrote:
Wed Feb 12, 2020 9:20 pm
Non-standard frequency scaling governor setting?
AIUI, that should not affect the firmware which has overall control.
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Re: Heat torture testing Pi4

Thu Feb 13, 2020 3:06 pm

Interesting. Testing here and i have been able to get to some very high temperatures even with an open air Pi4, with it remaining at 1.5GHz. So there is something odd in the throttling. Have passed on to the guy who knows.
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ejolson
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Re: Heat torture testing Pi4

Thu Feb 13, 2020 3:32 pm

jamesh wrote:
Thu Feb 13, 2020 3:06 pm
Interesting. Testing here and i have been able to get to some very high temperatures even with an open air Pi4, with it remaining at 1.5GHz. So there is something odd in the throttling. Have passed on to the guy who knows.
That's amazing! Don't forget to add a dollop of ice cream after your raspberry pie gets nice and toasty.

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Re: Heat torture testing Pi4

Thu Feb 13, 2020 3:51 pm

ejolson wrote:
Thu Feb 13, 2020 3:32 pm
jamesh wrote:
Thu Feb 13, 2020 3:06 pm
Interesting. Testing here and i have been able to get to some very high temperatures even with an open air Pi4, with it remaining at 1.5GHz. So there is something odd in the throttling. Have passed on to the guy who knows.
That's amazing! Don't forget to add a dollop of ice cream after your raspberry pie gets nice and toasty.
It was starting to smell a bit when it hit 108degC. Still running fine.
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Imperf3kt
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Re: Heat torture testing Pi4

Thu Feb 13, 2020 8:47 pm

Well, at least now we have some quantifiable proof that keeping a Pi cool isn't strictly necessary except for peace of mind reasons or not burning your fingers.

Although, I wonder what that temperature does to the life expectancy.
55:55:44:44:4C
52:4C:52:42:41

Rose coloured glasses are difficult to see through.

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Re: Heat torture testing Pi4

Thu Feb 13, 2020 9:29 pm

Imperf3kt wrote:
Thu Feb 13, 2020 8:47 pm
Well, at least now we have some quantifiable proof that keeping a Pi cool isn't strictly necessary except for peace of mind reasons or not burning your fingers.

Although, I wonder what that temperature does to the life expectancy.
It's always been for safety reasons - its a bare board - you cannot afford to have it sitting at over 100degsC when children may be using them.

High temps will affect the lifetime, especially at the temps that the OP was getting.
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