I bought a mac mini to use as an HTPC. Although the 2011 model runs quiet some of the time, I find it creeps up in volume (fan noise) as a movie progresses. These are not BlueRay rips or anything fancy or complicated. Just simple 700 MB avi files that the old Acer HTPC we were using had no difficulties decoding. We are using VLC and MPlayerX. This happens on both systems. Airflow around the system is clean and dust free. Ambient temperatures are normal room temperature (15°, ~60 F). Fans get up to 3000+ rpm and temperature reported by smcFanControl is 70°C+. If you pause the movie for even 30 seconds, the temperature drops and the fans shut the heck up. But this is distracting and shouldn't be necessary. First time it happened I thought our sprinkler had turned on because it sounded like rushing water through the pipes. Anyways. Anyone know of an enclosure or some mechanism to keep this thing running QUIET? (the exact same sample movies were tested on a 2009 model and we never encountered this noise issue - that was why we went this direction for 2011).