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Karcy 40mm x 40mm x 11mm Aluminum Heatsink Cooling Fin for Raspberry Pi IC Chips Cooling Pack of 5

When HN users recommended it

1 HN user recommended this in 2019, in one comment.

20072026

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What HN users said

StillBored linked amazon.com View on HN
in Cooling off your Raspberry Pi 4, a direct reply to the story

Outside of maybe the ICE cooling tower I suspect that all of these heatsink/fan solutions are woefully under specified if you happen to load the system or overclock.

I grabbed one of my little 20mmx20mm heatsinks which are generally good enough for devices of that size that come passively cooled. In the RPi's case that thing got hot enough to burn me even with a small fan. So I repeated this process a few times with stuff from my junk box trying to find a passive solution eventually I ended up with a 40x40x30mm heatsink (looks sorta like this https://www.amazon.com/Karcy-Aluminum-Heatsink-Cooling-Raspb... only that one says its 11mm) and a small fan.

The thing is huge, but the temps stay under control and it over-clocks @2Ghz now, but I wouldn't run it like that for long even with that heatsink. I've got mine pinned at 1.75).

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