2009 macbook unibody ram upgrade.

Discussion in 'MacBook' started by elf69, Jul 8, 2016.

  1. elf69, Jul 8, 2016
    Last edited: Jul 11, 2016

    elf69 macrumors 65816

    elf69

    Joined:
    Jun 2, 2016
    Location:
    Cornwall UK
    #1
    This has probably been asked but was not able to find using the search.

    My macbook has 6GB of ram upgraded from 2GB

    When I upgraded I did not notice I put in 2GB of 1066MHz and 4GB of 1600MHz.

    So I found 4GB of 1600MHz in a dead laptop in our scrap/parts pile at work.

    I installed and only get 3 beeps.
    So it is too fast for the "bios" or what ever apple use to use it.

    The 1600MHz must be clocking down to 1066MHz as they are mixed.
    Is it possible to clock down without mixing?

    I doubt this very much though.
     
  2. keysofanxiety macrumors 604

    keysofanxiety

    Joined:
    Nov 23, 2011
    #2
    Yeah the C2D CPUs won't even be able to address 1600MHz I believe. Regardless, 3 beeps is RAM issue. I wouldn't mix and match voltages/speeds -- so just stick with 1066MHz DIMMs in all ports to err on the side of caution.

    Best case scenario with mixing and matching speeds, especially on older Macs, is that it would work. More often than not, they''l crash/freeze/kernel panic, or just beep on startup as it is for you.
     
  3. elf69, Jul 8, 2016
    Last edited: Jul 8, 2016

    elf69 thread starter macrumors 65816

    elf69

    Joined:
    Jun 2, 2016
    Location:
    Cornwall UK
    #3
    mixed works fine here.

    I didnt even notice they where not same when upgraded it 2-3 weeks ago.

    Only when I found another 4GB stick i realized that the 4GB was 1600.
    I found crucial mac ram on ebay at £19.11 delivered for 1x4GB 1066.

    so Im gonna do that.

    But i'm gonna need two of them to max it out.

    not sure there enough gain to warrant two though, 6GB seems ok at min.
     
  4. elf69 thread starter macrumors 65816

    elf69

    Joined:
    Jun 2, 2016
    Location:
    Cornwall UK
    #4
    OK so now running on 4GB of 1600MHz and 4GB of 1066MHz and all is good.

    It has sped up boot quite a bit from 6GB to 8GB I am surprised.
     

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