CPU cooling options


#1

Hi,

Does anyone have any comparative stats of the two heatsinks here: https://shop.pimoroni.com/products/heatsink

i.e. does the 7.5mm provide an appreciable difference drop in core temperature compared to the 6mm one?

Thank you,


#2

I never no evidence but I doubt the difference would be much at all and you should only need one in the first place if you are pushing your pi to the max


#3

I’m tend to agree. The Slice forums are full of people who’s upgraded their Slice to Compute Module 3 and are using everything from glued together bits of copper to crushed copper pipe as a heatsink for a very heavily loaded CM3 in an enclosed environment. Outside of extreme circumstances any thermal dissipation on the Pi CPU makes enough of a difference that the difference between different types wouldn’t matter much.

We did test a whole bunch of heatsinks with an IR camera, though, which is what prompted the vent holes at the bottom of the Pibow 3 Coupe (previous holes weren’t for air, but rather LEGO). I don’t know if we kept any of that data though!

For best cooling, and flair, though, I’d suggest picking up a 5V DC 20mm fan. I offer this advice more because I think they look adorable than for any practical reason, but moving a little air over a 6mm heatsink would most likely net you better cooling than a larger heatsink alone.


#4

Thanks for the feedback so far – it is hard to imagine that it would give much of a difference!

The problem with our setup isn’t so much the CPU load but the ambient temperature - the board is in a (largish) enclosure, but this is mounted outdoors, likely in direct sunlight, in a part of the world where 45C+ temperatures are not uncommon!

we have a stirrer fan in the enclosure, but just trying to dissipate as much heat as we can.