From the manual:
Do Not Make Repairs Yourself
Dont open your Mac Pro except to install memory and solid
state drives (SSD), and dont attempt to repair your Mac Pro
by yourself. Your Mac Pro doesnt have any user-serviceable
parts, except for memory and SSDs. Please follow instructions
provided by Apple in memory and SSD kits. If your Mac Pro
needs service, contact an Apple Authorized Service Provider
or Apple for service.
If you open your Mac Pro or install items other than memory
and SSDs, you risk damaging your equipment. Such damage
isnt covered by the limited warranty on your Mac Pro.
So make of that what you will.
----------
It voided the warranty on your superdrive, original drive, and likely the SATA connectors.
Do Not Make Repairs Yourself
Dont open your Mac Pro except to install memory and solid
state drives (SSD), and dont attempt to repair your Mac Pro
by yourself. Your Mac Pro doesnt have any user-serviceable
parts, except for memory and SSDs. Please follow instructions
provided by Apple in memory and SSD kits. If your Mac Pro
needs service, contact an Apple Authorized Service Provider
or Apple for service.
If you open your Mac Pro or install items other than memory
and SSDs, you risk damaging your equipment. Such damage
isnt covered by the limited warranty on your Mac Pro.
So make of that what you will.
----------
then explain this:
i took my superdrive out of my (2010) mbp, installed an ssd in the original drive's place and put the original drive in place of the superdrive.. that's well beyond a cpu swap as far as 'modification' is concerned..
..and my applecare remained intact.
i think you're (and others) making assumptions and stating them as fact.. is this a possibility?
It voided the warranty on your superdrive, original drive, and likely the SATA connectors.