Hey! I thought I read somewhere here that the single CPU boards for the 4,1 and 5,1 Mac Pro's are interchangeable... then, I got to looking at ads for the 2009 4,1 single cpu boards, and they appear to only function fully in a 4,1 Mac Pro (fan SMC is still 1.39f5) Is this correct? Or, will a 4,1 board be able to be ungraded to 5,1 and run the fans at variable speed like the 5,1 boards. They do have the same part number, but different model numbers. I am aware that the single cpu boards do not run de-lidded cpu's, so that is good.
Does upgrading the 2009 4,1 single cpu board to 5,1 change the behavior of the SMC, or will it still run the fans at full speed like the dual cpu 2009 boards do? In essence, do I still need a single cpu board with the 1.39f11 SMC firmware for a 2010-2012 Mac Pro?
Thanks!
Charlie
[doublepost=1548866286][/doublepost]
https://forums.macrumors.com/threads/mac-pro-4-1-cpu-tray-in-5-1.1870311/
Does upgrading the 2009 4,1 single cpu board to 5,1 change the behavior of the SMC, or will it still run the fans at full speed like the dual cpu 2009 boards do? In essence, do I still need a single cpu board with the 1.39f11 SMC firmware for a 2010-2012 Mac Pro?
Thanks!
Charlie
[doublepost=1548866286][/doublepost]
I think I found my answer...
https://forums.macrumors.com/threads/mac-pro-4-1-cpu-tray-in-5-1.1870311/