05-19-2016, 03:58 AM
(05-17-2016, 03:26 PM)baryluk Wrote: Also you totally missed the point about the economy part. Adding 2 120 fans and will easily make it failed project due to crossing the cost threshold I stated in the post.
Forgot to address this concern. I was talking about 2 120 mm fans per cluster. I was talking about that already in another cluster thread here: http://forum.pine64.org/showthread.php?t...31#pid7431
I tested this with a few H3 boards and 90mm fans and it works quite well. With Pine64 it should work even better since with vertical mounting you can build a tower with inner dimensions of 90x90mm with 6, 12, 18 or even 24 Pine64 (calculate with 18-20cm height per 6 x Pine64) and using 20mm cardboard stripes you control the airflow between two boards so the SoC with mounted heatsink becomes a narrow point so that as much air as possible will flow over the heatsink's surface.
The 120mm fans on the bottom and top do not need to rotate that fast so this approach is also almost silent.