The liquid cooling is NOT - as Apple suggests - because a dual 2.5 GHz packs so much more power (and thus emits more heat) than say a dual 2 GHz. It's more likely an effort to quiet the machine down, because I imagine that not having 9 fans drawing power will tend to quell the stupid Power Supply coil vibration problems they've been plagued with. They couldn't figure out a way to make the Power Supply thing go away, without drawing less power I suspect.
...into the light of a dark black night.
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