Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
the dual- and quad-core models have two different fans, it seems. the fan in the dual-core has more fins/blades, the one in the server has less fins/blades. at 800% CPU load it still gets pretty noisy as the 2011 model did. removing the bottom cover helps a lot: the fan within a minute slows down quite a bit.

Interesting, thanks!:)
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.