ProDigit
Posts: 376
Joined: Tue Aug 30, 2011 1:24 am

Re: Raspberry Pi 4 temperature

Sun Oct 25, 2020 6:43 pm

davidtuti wrote:
Sun May 24, 2020 10:10 am

There are also cheap stick-on heat sinks, and this one is very effective and very cheap:
https://uk.rs-online.com/web/p/heatsinks/7500951/
I see that it seems heatsinks are not very efficient https://youtu.be/E-4GaAz7XNM
The heat sinks in the video were the size of the CPU die.
The heat sinks in the link, are about 4x larger.
The heat sinks I use, cover the CPU, RAM and all.
Passive heat sinks don't cool that well. Especially not those with the tape they're using.
I tested out the sticky heat sinks, vs identical heat sinks without sticky back, and using dual sided tape. And both had identical cooling results.
The best thing is to get a heat sink without sticky back, and mount it with thermal paste.
For as long as the unit is kept horizontal, the thermal paste will keep the sink in place.
Additionally, one can give very good cooling, by using a 12V case fan (120-140mm, in case you have multiple units), and run them at 5V, or run 5V fans at 3.3V. They offer cooling of more than 20-25C.

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jahboater
Posts: 6299
Joined: Wed Feb 04, 2015 6:38 pm
Location: Wonderful West Dorset

Re: Raspberry Pi 4 temperature

Sun Oct 25, 2020 8:53 pm

ProDigit wrote:
Sun Oct 25, 2020 6:43 pm
The best thing is to get a heat sink without sticky back, and mount it with thermal paste.
For as long as the unit is kept horizontal, the thermal paste will keep the sink in place.
This heatsink from RS is 3.5K/W and has no tape:
https://uk.rs-online.com/web/p/heatsinks/6744835/

this one is 8.2K/W and has a foil based tape pre-applied, so it may be used vertically to good effect:
https://uk.rs-online.com/web/p/heatsinks/7500951/
Pi4 8GB running PIOS64 Lite

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