Which picture is also the final answer to the question upthread about upgradability from single-socket to dual: the whole bottom half of the case innards looks different from the dual-socket version on Apple's website.
Yea, it looks like the main board and the rest of the machine are the same, it's just the daughter board that has the CPU and RAM on that seems different. It's a totally different board, notice how smooth the PCB is on the LHS, there are no holes to mount missing components etc...
I think realistically most customers, including myself, won't be upgrading the CPU. Apple have capitalised on that fact, and reduced their costs by being able to use CPU's that don't support multi CPU motherboards. Pretty cleaver if you ask me.
The heat sink is cooled by 2 large fans, one at the front the other at the rear of the case. It's the biggest heatsink I have ever seen I think
Cheers
Cris.
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