So I have a board at 75 degrees running 30% underclocked in a subzero air environment. I am desperately seeking firmware updates!
Why are you underclocking even though you're running in a sub-zero environment? Squeeze the max out of your A3 now before difficulty sky rockets.
Because running it underclocked is better than running it at 0? Chip temps on one board exceeded 100 degrees and the pcb was around 82 degrees. Auto shutoff occurred.
As much as I would like to run it into the ground, it has to actually function.
Most likely it is heatsinks not attached properly or something with airflow, as it seems board 3 is 15 degrees hotter than the other 2.