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Old 08-10-2017, 10:30 AM   #1
Mike McKay
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Talking Raspberry Pi (Sub)Zero - Chilling RPI2 with TECs

Video of it in action is here - https://youtu.be/oF65bqVqZPM

I'm in the process of building a monster TEC-chilled-liquid-cooled Ryzen 7 beast which I'll be posting pics and details of on here soon (see it here http://forums.extremeoverclocking.co...d.php?t=375138) ...but while I'm waiting for the very last parts for it to be complete to show up in the mail...in the spirit of tinkering for no good reason, I decided to play with some of my spare parts at the opposite end of the performance spectrum.

I had a spare Raspberry Pi 2 Model B+ which I loaded with RetroPie, Emulation Station and a ton of ROMS to play old games on...but it wasn't quite extreme enough...

So, I hacksawed the GPIO, camera and monitor pins off to make room for 2x stacked Peltier modules on the main chip, powered them via a spare ATX power supply and cooled them with a PC CPU heatsink/fan. The cooling setup uses about 120 additional watts, because the TEC contacting the chip is on 5V and the hotter TEC is on 12v. There is a lot of thermal compound and glue involved...

When I power on that power supply, the TECs and fan kicks in and the main chip goes from the 40s to below 0C in under a minute. The temperature bottoms out around -10C to -5C. (Without the stacking, one TEC brought it to a minimum temperature of about +3C)

I haven't played much with overclocking *yet*, but it was able to handle core frequency of 550mhz (from 450) and arm frequency of 1100mhz (from 900) without any issues or significant voltage increases.

Next steps are to measure temps with the 2nd fan running (temps so far are only with 1), insulate the back so ambient heat doesn't leak in and to run the Pi itself from the 5v on the PSU instead of its own USB adapter.

\m/
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Last edited by Mike McKay; 08-10-2017 at 01:40 PM.
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