I'm looking at buying a used Mac Pro. However, I want to know what I'm really buying as the serial number he provided does match the processor configuration in the About This Mac:

enter image description here

EveryMac says this is what the machine is according to its serial number:

enter image description here

The 2.4 GHz 6-Core configuration wasn't released until 2012 according to EveryMac:


So my question is, am I buying a 2009 Mac Pro, originally shipped with an "Eight Core" main board, but has been upgraded to a 2012 2x 6-Core main board?

If so, will I need to upgrade the firmware to match the new board?

1 Answer 1


The firmware had to have been updated before the newer processors were installed.

The differences between the 4,1 '09 & the 5,1 '10 - '12 are minimal. What you're looking at is a hybrid, older machine [quad-core Nehalem originally] with upgraded firmware & newer 6-core Westmere CPU.

In itself, there's nothing inherently wrong with that - I'm typing on one right now.
The fans are a little noisy - my older 3,1 you cannot even hear the fans until it's working hard - but it really has no issues, to all intents & purposes it's now a 2012.

This is mine

enter image description here

The 5,1 upgrade does allow it to run Sierra too - I just don't like Sierra.

  • 1
    An extra +1 for your sentiments re: Sierra.
    – Allan
    May 14, 2017 at 14:57
  • Thank you. So for all intents & purposes it's now a 5,1 Mac Pro now as well? May 14, 2017 at 14:59
  • 1
    It is - they're not identical, but to all intents & purposes, yes.
    – Tetsujin
    May 14, 2017 at 15:01

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .