Apologies in advance but I am not Oldturkey03
But I do know that the cpu will work in a Mac Pro 4,1 BUT ONLY IF YOU FLASH IT TO 5,1 I cannot stress this enough,in order for this to work you need to do it
As for de-liding people really like to charge a premium for delided cpus so I would order a deliding vise and to it manually
I have a 5,1 and it has the Intel Xeon X5675 so just a little more assurance for you :-)
Hopefully this answers your question
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