I tested the Khadas VIM1. VIM work without errors.I drove 1,000 km in 40 degree heat. VIM was no fan, only heatsink. The CPU temperature 69 degrees, when watching a video through YouTube up to 81 degrees maximum. The internal chassis temperature is 43 degrees. Time of continuous work more than 15 hours. The test was repeated 4 times.
Temp on case
My case again
Vim with heatsink, RTS battery and gps/glonass reciver