"When air cooling often times it is not the thermal conductance of air, or the heatsink that limits how much cooling you can accomplish, it is the sheer volume of the system. Whether you are using normal fans or Delta screamers chances are some airflow device in your system is creating racket enough to keep you awake at night. Perhaps one of the greatest contexts for concern is the college dorm room; there is a great chance that your room mate does not share the same passion for computers and the sound of your power supply droning on through the night is wearing relations thin. There are many avenues that one can take to palliate the symptoms of such a situation, and "Muffled computing" has done their best to offer a line of products designed at reducing your PC earaches."
FULL STORY @ SUBZEROTECH (http://www.subzerotech.com/index.php?module=sz_reviews_display&id=103)