As a Mac guy, I have followed the heat management issues that have been so important, they have dictated corporate policy.  The reason that Apple dropped IBM for Intel is that IBM either could or would not come up with a more energy-efficient chip.  The G5s had 11 fans to manage the heat in a dualie,  When Apple switched to Intel, the same case that held the G5 could now hold 16 gigs of physical RAM, and 3 Terabytes of hard disc storage because there are fewer fans and dramatically smaller heat sinks.

My G4 has a pretty noisy fan but it is nothing compared to the late G4s that were called "wind tunnels" by their critics.  Apple actually put a version of my CPU in a laptop.  But I have three hard drives and I assume heat is probably a bad thing for electrical componets (I still remember tubes) so I am being careful.  I'll probably over-engineer something, if the past is a guide.

"Remember the I35W bridge--who needs terrorists when there are Republicans"