Hello！
Japanese‘s testing proved the point the 4570r’s Power consumption is much better than A-10 7850k. they said BRIX Pro 4570r‘s max power consumption is 80-90w ,but i don't know the max temp,so i;m sorry i can't help you
some Chinese businessman told me Gigabyte BRIX Pro 4770R have the Version that have no fan on radiator.
maybe i should buy one to see whether i meet the some problem 