To measure idle temperatures, a reading was taken after having Windows open on the desktop for 30 minutes. A reading under load was taken by simultaneously running Prime 95 and 3DMark Firestrike. Prime95 stresses the CPU while 3DMark puts a heavy load on the GPU without it throttling back (as would be the case for a synthetic stress test).
I was actually very (pleasantly) surprised with the thermals on display here. I was expecting the temperatures to be through the roof, given both the CPU and GPU have passive heatsinks – all the airflow comes from the single 80mm intake fan.
However, both results coming in at under 80 degrees Celsius is certainly a good outcome considering the very small form factor we are dealing with here.