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Define changeable.

If you have a single chip model, you can add a second. If you have a dual-chip model, you can add the 3.0GHz chips.

If you want to add 3.2GHz chips, you have to buy them AND buy different heatsinks, as they have a special thermal requirement.
 
If i get a single 2.8 ghz quad later on i can add another 2.8ghz? and upgrade everything else?
 
What you're suggesting is in no way cost effective...as I understand it, you wouldn't be saving money by doing this, as apple gets these chips far cheaper than we do. That could have changed recently, I guess, but I really doubt the utility of this approach.
 
What you're suggesting is in no way cost effective...as I understand it, you wouldn't be saving money by doing this, as apple gets these chips far cheaper than we do. That could have changed recently, I guess, but I really doubt the utility of this approach.

Yes, Apple undoubtedly gets better pricing because they buy thousands of chips. Upgrading the Mac Pro is about $800 for the chip plus a $200 heat sink. Not particularly economical.
 
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