"The most obvious difference in this case is the internal cavity is
divided into two separate chambers. The thought is that if the items
that generate the most heat can be segregated, then the overall system
temperature and noise will be reduced. The upper chamber is designated
for the motherboard, expansion cards, 5.25" and some 3.5" drives. A
total of three 120mm and one 80mm fans can be used to assist in the
cooling of this section. The lower chamber resembles a wind tunnel and
is reserved for the PSU and more hard drives. This section is cooled by
a 120mm fan mounted between the PSU and hard drives. Choosing to mount
the fan internally should help remove that as a potential noise source."
FULL STORY @ MISSINGREMOTE (http://www.missingremote.com/index.php?option=com_content&task=view&id=634&Itemid=152)
