IMO, that's sort of his own fault, particularly when we don't know the backround story (ie: voltages, clock speeds, etc).

ANY heatsink is in place to dissipate heat through the use of airflow. In a computer case, there's airflow moving over them which is why most people clue into the fact that out of case testing needs the same type of air movement.

See EVA2000's response above. That's the SMART way to do open system testing. In the video above, you see the clueless way.