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ric96
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Rpi 3 Cooling Experiment

Sat Apr 02, 2016 8:58 pm

So i did an experiment on what is the best way to cool the raspberry pi 3.
I used three scenarios and used the 'stress' program to stress the pi3's cpu.
a) Without heatsink: it took about 1min:30sec to reach 80c and thermal throttle
b) With just a Heatsink it took around 3min to reach 80c and thermal throttle
c) With a heatsink and a fan pi3 did not thermal throttle and maintained temps around 60c

Video https://youtu.be/2i4u1KaNB8Q

I thought that It would be OK with just a heatsink, BUT
Even though these were synthetic tests and not the real scenarios. I did try to compile tangram-es and the pi3 quickly reached 81c in around 3min. So what is happening is that due to the lack of sufficient airflow the heatsink only delays the rise in temp.

So until or unless you do not plan to compile stuff on the pi3 and use it for lightweight stuff like kodi or robot controller etc. you should invest in a small fan.
My apologies for shameless YouTube Plugs...
youtube.com/sahajsarup
twitter @sahajsarup
skype srics1996
e-mail: [email protected]
Blog: http://www.geektillithertz.com/wordpress
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pxgator
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Joined: Mon Feb 16, 2015 6:45 pm
Location: Southern Colorado, USA

Re: Rpi 3 Cooling Experiment

Sat Apr 02, 2016 9:11 pm

ric96 wrote:
So until or unless you do not plan to compile stuff on the pi3 and use it for lightweight stuff like kodi or robot controller etc. you should invest in a small fan.
I agree and here is an inexpensive solution that works:
http://www.ebay.com/itm/221950553658?_t ... EBIDX%3AIT
So what's all this RPi stuff anyhow? Well folks, it's a feat of engineering from
the UK almost as remarkable as the De Havilland Mosquito and the Colossus.

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Rive
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Re: Rpi 3 Cooling Experiment

Sat Apr 02, 2016 9:33 pm

Overclock stress test @ 65C:
viewtopic.php?f=29&t=142865
Last edited by Rive on Sat Apr 02, 2016 10:02 pm, edited 3 times in total.
DNPNWO

mosespi
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Re: Rpi 3 Cooling Experiment

Sat Apr 02, 2016 9:38 pm

ric96 good experiment!

I always see very small heatsinks on the Pi.. of course its easy to just mount a heatsink the same size of the Pi SOC and be done it.. but has anyone tried a larger heatsink? Maybe another experiment for you ric96? Might need to cut up and modify a larger heatsink.

Remember these higher power SOCs are usually attached to pretty big thermal sinks in tablets and phones (aluminum backings or internal metal frames), and most have no fan. Obviously a larger heatsink will get better results, I would say at one point you might get acceptable performance and not need that fan. Personally I hate adding moving parts to an otherwise solid state computer.

Regards,
-Moses
Power problems? MoPower UPS for the Pi
http://www.allspectrum.com/mopower/

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Rive
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Re: Rpi 3 Cooling Experiment

Sat Apr 02, 2016 9:41 pm

Just use a regular pc fan ($5 in US at like Bestbuy, or Micro Center), and a regular official case (remove one side for ventilation)....


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Last edited by Rive on Sat Apr 02, 2016 10:05 pm, edited 2 times in total.
DNPNWO

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ric96
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Re: Rpi 3 Cooling Experiment

Sat Apr 02, 2016 9:42 pm

mosespi wrote:ric96 good experiment!

I always see very small heatsinks on the Pi.. of course its easy to just mount a heatsink the same size of the Pi SOC and be done it.. but has anyone tried a larger heatsink? Maybe another experiment for you ric96? Might need to cut up and modify a larger heatsink.

Remember these higher power SOCs are usually attached to pretty big thermal sinks in tablets and phones (aluminum backings or internal metal frames), and most have no fan. Obviously a larger heatsink will get better results, I would say at one point you might get acceptable performance and not need that fan. Personally I hate adding moving parts to an otherwise solid state computer.

Regards,
-Moses
Idk if i can do it on the rpi, but i have an Intel Atom z3735g (1.3ghz, quad core) dev board with a heatsink big enough to fit 6 pi heatsinks, without any fan. And this board barely touches 60c with the exact same tests.
My apologies for shameless YouTube Plugs...
youtube.com/sahajsarup
twitter @sahajsarup
skype srics1996
e-mail: [email protected]
Blog: http://www.geektillithertz.com/wordpress
Web: http://www.geektillithertz.com

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ric96
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Re: Rpi 3 Cooling Experiment

Sat Apr 02, 2016 9:45 pm

Rive wrote:Just use a regular fan, and a regular official case (remove one side for ventilation)....


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Fan size never really mattered in my case. Smaller fans around 1.5inch to 1 inch with high static pressure directly above the heatink do the job as good. Also draw less power at around 5v @100mA
My apologies for shameless YouTube Plugs...
youtube.com/sahajsarup
twitter @sahajsarup
skype srics1996
e-mail: [email protected]
Blog: http://www.geektillithertz.com/wordpress
Web: http://www.geektillithertz.com

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