mcnpower
Posts: 8
Joined: Tue Nov 01, 2016 5:41 am

CM4 Passive Cooling

Mon Jul 19, 2021 11:48 am

There are many aluminum heatsinks made specifically for the CM4. Some of these are only contacted with the heatsink by placing a thermal pad on the processor. Some have also placed thermal pads on parts such as eMMC and Ram and come into contact with the heatsink.

Which of these is correct? eMMC, RAM, Wifi Module getting hot? If it does not heat up, do we put them in contact with the heatsink along with the processor and cause them to heat up? Or the more contact we make with the heatsink, is it good for the CM4?

Some examples heatsink for CM4:

https://www.waveshare.com/cm4-heatsink.htm
https://www.amazon.com/dp/B092PMY7RC/re ... WYVZQ9VFPN?
https://www.amazon.com/Geekworm-Aluminu ... B08PZ39L46

aBUGSworstnightmare
Posts: 3224
Joined: Tue Jun 30, 2015 1:35 pm

Re: CM4 Passive Cooling

Mon Jul 19, 2021 12:36 pm

My clear recommemdation is the Geekworm cooler viewtopic.php?f=98&t=298810

It uses TIM for the SOC and the RAM and allows for concection on the rest of the boards components.

It's quite often not the PMIC which gets hot, it are the coils. So, where to start with other components and wherento stop?

Edit: btw .. Stacking two pieces of TIM on top of each other is not the best idea.

mcnpower
Posts: 8
Joined: Tue Nov 01, 2016 5:41 am

Re: CM4 Passive Cooling

Wed Jul 21, 2021 8:23 pm

Thanks for the answer.

First thing I will do a stress test on CM4 and monitor it with a thermal camera.

I plan to see which parts are getting hot.

I'll post the results here.

aBUGSworstnightmare
Posts: 3224
Joined: Tue Jun 30, 2015 1:35 pm

Re: CM4 Passive Cooling

Thu Jul 22, 2021 6:41 am

mcnpower wrote:
Wed Jul 21, 2021 8:23 pm
Thanks for the answer.

First thing I will do a stress test on CM4 and monitor it with a thermal camera.

I plan to see which parts are getting hot.

I'll post the results here.
or simply look at available results https://www.jeffgeerling.com/blog/2020/ ... e-module-4
As you can see it's the SoC and the RAM which get's hot
Image
image by Jeff Geerling from the blog linked above

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