I checked in two modes when + 5 V and 3.3 V. the 5 V is some noise. When powered from 3.3 V, I can barely hear it. The experience of using the 3.3 , it is enough to maintain the temperature in the range of 60-65 G. at maximum load on VIM (which I could create). But I redid the body, which would be a free access of air in it (fan running pulling air from the case). Also installed a heatsink on the processor, it can improve the heat transfer of the excess heat of the incoming air. Without a radiator is the process of heat transfer much worse (area of air contact with hot surface is small).
(продублировал ответ на форуме 4pda на русском, так будет понятнее).