Comment by adrian_b

I wonder how good is the cooling of the stacked "robot brain".

It would be nice to see some temperatures in relevant points, when the computer is stress tested in the closed waterproof case and a hot ambient.

The Cortex-A55 based CPU has low power consumption, but it is not negligible and without a heatsink it may overheat and throttle.

Moreover, in a closed box, one may need some means to transfer the heat from the stacked electronics to the aluminum walls of the box. Finding suitable means may be more complex for this design, because of the curious choice of using 2 weak SBCs instead of 1 good SBC, so there are 2 sets of CPU + memories that must be cooled.

From the provided pictures, I cannot see how the electronics would be cooled well enough, especially when working outdoors during a hot day.