Why are there always two Apple part numbers?

Discussion in 'MacBook Pro' started by tmcdanel, Mar 16, 2014.

  1. tmcdanel macrumors newbie


    Jul 6, 2008
    I wanted to buy a video adapter for my MBPro and was able to see the model number on the old one: A1307
    But looking for it i found it is also called MB572Z/A

    I know this is an old question, and apologize i could not find the answer with Google but it seems so stupid, i want to know the answer. There is always the same confusion with Macbook model numbers. There never seems to be a simple consistent clean model number when you are looking for parts. If you look in the system description it gives some ambiguous 9,2 when you need to know A####.. you have to know when it was manufactured.. I am not even sure the model # is written on the case.
    Why two Applemodel numbers on parts?
    Why all the confusion?
  2. triplelucky macrumors regular

    Sep 30, 2012
    Tucson, Arizona, USA
    The “A” number can be a series. The “MB” number can be a specific model within that series.

    You can use the “serial number” that is on the bottom of the case to look up exact date info.
  3. tmcdanel thread starter macrumors newbie


    Jul 6, 2008
    Why ...

    Why aren't MB# & A# shown in the system profile?

    What is
    Model Identifier: MacBookPro9,2
    or whatever, in the profile?

    Thank you for removing some confusion. That seems straight up. But some still remains in my density.
  4. simon48 macrumors 65816


    Sep 1, 2010
    It's major revision, minor revision.

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