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You have to understand MacPro is not just about spec and numbers. The hefty price tag is kinda proper. First and obvious they use Xeon processors, and then ECC buffered RAM.

Mainboard itself made for server/workstation grade components. MacPro specification may seems lower than the one on iMac. But iMac using regular desktop components. Yeah sure iMac today with i7 3.4GHz could be faster (at least in some apps) compared to even hexcore 2010 MacPro.

But as OP said, MacPro 2011 would change the game once again. But yeah, not everyone out there could/would afford luxury of $3500 computer
 
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