Max Ram for a Macbook Pro

Discussion in 'MacBook Pro' started by arstacey, Jul 28, 2012.

  1. arstacey macrumors newbie

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    May 4, 2012
    #1
    I have a mid-2009 13" Macbook Pro MB990LL/A. This unit uses DDR3 1066Mhz memory and is listed as supporting up to 8GB of ram. Of course at the time you could not get a single 8GB stick of ram. Does anyone know if these can support 16GB (2 x 8GB) of DDR3 1333Mhz RAM?

    On a pc or server motherboard often the max ram listed is just the number of slots times the largest available dimm at the time, and faster ram will scale back to the speed of the motherboard. When larger dimms come out you can almost always go higher than the listed specs. If you cannot do this with Apple products, could someone explain what is prohibiting the machine from accepting the larger dimms?
     
  2. GGJstudios macrumors Westmere

    GGJstudios

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    May 16, 2008
    #2
    No, 8GB is the max.

    You can find specs on all Apple products, including maximum RAM:
     
  3. arstacey thread starter macrumors newbie

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    May 4, 2012
    #3
    Do you know what prevents it from accepting 16GB of ram? Is it a bios setting or something in OSX? I know it is listed as 8GB Max, but again that was the max that was available at that time in a 2 dimm configuration.
     
  4. GGJstudios macrumors Westmere

    GGJstudios

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    #4
    It's not a limitation of the available RAM modules. It's a hardware limitation.
     
  5. Feed Me macrumors 6502a

    Feed Me

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    #5
    What is the nature of this hardware limitation?
     
  6. GGJstudios macrumors Westmere

    GGJstudios

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    May 16, 2008
    #6
    It's a limitation in the chipset.
     
  7. arstacey thread starter macrumors newbie

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    May 4, 2012
  8. andyriot macrumors member

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    Jul 1, 2010
    #8
    Interesting idea though... has anyone tried it?
     
  9. T5BRICK macrumors 604

    T5BRICK

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    #9
    I'm sure someone has. I Imagine it either didn't work at all or showed up as a partial capacity.
     
  10. felic macrumors newbie

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    Nov 25, 2013
    #10
    Okay continuing on from where this thread left off as I have a related question on RAM compatibility to MacBook Pro 13" mid-2009 model. Officially Apple states max RAM speed as 1066mhz. Would a higher speed at 1600mhz be compatible?
     
  11. ammusk macrumors regular

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    Oct 20, 2009
    #11
    Yes but it would run at the slower 1066mhz
     
  12. felic macrumors newbie

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    Nov 25, 2013
    #12

    Oh I see. So the 2009 MBP was built to run at that speed as a maximum I guess?

    Thanks for the response.
     

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