Yeah, its an unbelievably small fan that has to get up to mach 17 to move enough air to cool it. I was kinda shocked at the terrible design! A little more room and they could have put a much bigger fan in there. I wonder if it was maybe supposed to be fanless originally and they missed the thermal target
There's no fan on the Roamio's stream chip, just a heatsink that's cooled by the airflow through the whole box.
-Roamio Pro/Slide Pro
-Stream (Gotta go unplug the sucker one of these days!)