Yes, the fans draw more power, but are very largely compensated by the drop in draw of power on mining...

The only thing, which I could confirm with the 19, block the ventilation at 100% manual, if the miner is too cold (chip at 60 or less), then look carefully at the kernel !!! it increases the voltage... why? simply to stay in the "manufacturer" range and not be too efficient! the adjustment is done after 30min

in the new firmware, I did not wait 30min to confirm it, to try

but please just do the test i said, you learn about miners