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Highly doubt it mine where I have done the swap is still under warranty for another 2 years if it ever dies in that time frame I am going to put back in the old cpu, ram and video card if still dead then back to Apple it goes.

+1

If you get the right long-handled Allen Wrench, removal/reinstallation of the heatsink is very fast. The job is only time-sconsuming if updating the dual CPU 2009 4,1 Mac Pro. Yours will be very easy.
 
photophil - if you are not confident in doing the cpu swap yourself, have you considered seeing if there is someone on this forum who is near your home town who would do the work for a few bottles of craft beer and a pizza if you supply the parts?
 
OP, get the right wrench (even getting a set isn't too expensive) so that there's no mucking around reaching the screws, get a heatsink kit that comes with cleaner and paste (Arctic Silver comes to mind) and it's really not a difficult task.

As others have said, if you put in the faster memory it operates at the faster speed.

It's worth doing.
 
MRI must be performed before all repairs (unless machine does not boot, then it must be documented), and MRI run again after all repairs. Other diagnostics (NAD, Storage, Trackpad, etc) as required.

Upgrading the CPU will definitely void your AppleCare, and any RAM upgrades will be warrantied by the manufacturer, not Apple.

Yep you're correct. And the Apple service center also told me the MRI is only valid for 1 or 2 weeks ( not sure I could be mistaken ) and after that time frame another MRI is needed again should another repair is to be prerformed.
 
What's the purpose of the MRI? Does it allow them to read the print on the CPU lid?
If they need to know whether you swapped CPU's, then all they'd need to do is look at 'About This Mac'.
 
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