My experience so far with a 80mm, 12V, 350mA, 4800RPM fan is mixed. Fan does its job well – it keeps the sensors at not much above 40C when CPUs are busy at 2GHz and DDR4 is at 2400, but it’s the loudest thing in the room by far (45-ish dB).
Indeed, that u-boot prompt is a real heat hazard on the macchiatobin. The highest temp I’ve ever read on the mcbin was in the u-boot prompt – tsen reported 89C, after I had left u-boot prompt unattended for some time, under passive cooling.
I’ve just ordered a cooling fan myself. I found that the passive cooling simply was not sufficient.
I’m running Ubuntu 16.04.3 LTS (as per the macchiatobin wiki) and my system is quite hot even when idle:
thermal_zone0 = 70 c
thermal_zone1 = 66 c
thermal_zone2 = 66 c
I’m concerned to run anything heavy as I do see the temperature go up very rapidly when there is anything CPU/memory intensive for example. Of course heat is the enemy in this case – so want to avoid damaging this board.
Any suggestions? I hope to have the cooling fan in the next few days.
Apparently board’s passive cooling was designed for ambient-t-controlled environments, and most developers’ workbenches clearly do not qualify. So active cooling is the way to go, and the purpose of this thread ; )
Re fans, in my experience 80mm-diameter fans are perfect for positioning right by the edge of the board, blowing at the SoC’s heatsink (incoming ascii art warning):
| I |
| I |
F->| . ### |
F->| . ### |
| DDDDDDDDDDD |
N - network connectors
I - PCIe3.0 x4 slot
. - missing JTAG connector
F - 80mm fan
D - DIMM
# - SoC
-> - airflow
Clearly, a solution where the fan is positioned right on top of the heatsink would be optimal, but the board does not provide any attachment means for such contraptions.
Thanks for your reply. I have a fan on order and will scale back the tests I started performing – which led to: kernel: armada_thermal f06f808c.thermal: Overheat critical high threshold temperature reached
After 60 minutes the temperature hovers around 67C (up from 50C at idle) in a room that is 23C. Power consumption is 19W (including 4GB RAM, 120GB SATA SSD, and 1Gb ethernet). There’s been no thermal throttling.