"While Cooler Master isn't the first manufacturer to use honey comb
structure in their power supplies, they have used it in bit different way.
Only the side that will be facing out from the case is opened this way.
Some manufacturers have included similar openings to the front of the unit
but that will only push warm air back to the case. Cooler Master's
solution ensures that all the air that gets sucked inside the PSU will be
forced out from the system."
FULL STORY @ METKU (http://www.metku.net/index.html?sect=view&n=0&path=reviews/realpower450/index_eng)