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Wizardling
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Are there longer more effective Pi-sized heatsinks for sale?

Thu Nov 24, 2016 10:52 pm

G'day.

I'm thinking about maybe really pushing overclocking in an environment I'd desire silence.

Thus I wonder if there are some longer (given that many cases have holes over the chips, so longer is easier to mate with a case, than wider, I'd think) heatsinks for sale, that would fit the PI 3's main chips?

Or I could go with a case like http://c4labs.net/products/rebel-for-ra ... -2-b-and-a , leave the top off, put a long heatsink on the memory chip, and either a longer and/or wider one on the CPU as there's no bottom (see pics - the Pi is suspended upside down) to this case.

But, not being a maker myself, I wonder if any suitable heatsinks are available pre-made from somewhere? Has anyone done something similar? Thoughts?

TIA!
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DougieLawson
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Re: Are there longer more effective Pi-sized heatsinks for s

Thu Nov 24, 2016 10:58 pm

If my RPi3 wasn't bolted to the back of my official screen and I had a desire to install it in a case and run it hard enough to need a heatsink then I'd buy this one: https://flirc.tv/more/raspberry-pi-case

Don't know if it's available in your part of the planet. But it looks seriously cool and should be seriously cool (since the case is the heatsink).
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Wizardling
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Re: Are there longer more effective Pi-sized heatsinks for s

Thu Nov 24, 2016 11:25 pm

I ordered that flirc case, and will test it out when it arrives. There was a reseller in NZ, but I found a cheaper one internationally. So it'll wend it's way across the Pacific to me, in a week or two.

I still like the idea of longer heat sinks, though. Then I can just use any old cheap case with holes over the chips, or the deep sized cases I've seen. Or that cool looking Rebel case above. Plus it would look weird with long heatsinks poking out, and I like weird. This isn't going to be used for an entertainment centre in the living room, so the weirdness appreciation is just for me :-) But it will be right next door to my bedroom, so quietness is important. I enjoy falling asleep to music (I set a half hour's long playlist, and drift off). Not so much hissing and whirring.
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HawaiianPi
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Re: Are there longer more effective Pi-sized heatsinks for s

Thu Nov 24, 2016 11:30 pm

Look into porous-ceramic heatsinks. They are usually much more effective than a metal heatsink of comparable size.

The metal cases that double as a heatsink like Dougie suggested could also work well, if they are engineered properly.

If you really want to push overclocking to the breaking point, run without a case and water-cool it. Or find a Pelt that will fit and chill it below ambient.
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Douglas6
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Re: Are there longer more effective Pi-sized heatsinks for s

Fri Nov 25, 2016 12:28 am

Adafruit has several sizes of heatsinks for the Pi.

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Wizardling
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Re: Are there longer more effective Pi-sized heatsinks for s

Fri Nov 25, 2016 12:46 am

Douglas6 wrote:Adafruit has several sizes of heatsinks for the Pi.
Ohhh... https://www.adafruit.com/products/3082 :-)
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tweak42
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Re: Are there longer more effective Pi-sized heatsinks for s

Fri Nov 25, 2016 8:52 am

Why not just scale up and use a full size cpu heatsink like this guy?

https://www.youtube.com/watch?v=1AYGnw6MwFM

Tinderbox (UK)
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Re: Are there longer more effective Pi-sized heatsinks for s

Fri Nov 25, 2016 9:14 am

Here are some ceramic heat sink`s they use to have an 15x15 but it maybe out of stock.

I think an 25x25 is the largest you can fit before you hit board components unless you use a shim to raise the heat sink up a bit.

http://stores.ebay.co.uk/PCArena-Bristo ... ol&submit=

A couple of links on heatsinks and fans

https://www.element14.com/community/com ... ent-92890=

https://www.element14.com/community/com ... ment-92938

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jahboater
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Re: Are there longer more effective Pi-sized heatsinks for s

Fri Nov 25, 2016 9:45 am

Tinderbox (UK) wrote:Here are some ceramic heat sink`s they use to have an 15x15 but it maybe out of stock.

I think an 25x25 is the largest you can fit before you hit board components unless you use a shim to raise the heat sink up a bit.
I have just fitted a 30x30 ceramic heatsink to a Pi2V2.

Looks like its the largest that will fit.

I think these heatsinks are non-conductive so maybe its not too bad if it touches something.

alphanumeric
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Re: Are there longer more effective Pi-sized heatsinks for s

Fri Nov 25, 2016 11:27 am

If you have an old dead PC motherboard kicking around, pull the chip-set heat sink off of it. They are usually wide and flat. You can buy sheets of the double sided sticky heat sink thermal pads at places like Adafruit. Then just cut the pad to match the CPU, and one small one for the other chip over by the USB jacks. Put those pads on chips first, then the heat sink on top straddling the two. I'd use two smaller pads instead of one big one so the dust etc doesn't stick to the bottom of the thermal pad where nothing is touching it.

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