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  1. #1

    Member Since
    Jul 18, 2012
    Lion does not boot after RAM upgrade, Bootcamp fine
    Hey guys.

    I just upgraded my MacbookPro (mid-2010 13'') to 8GB of RAM. The original RAM was DDR3-1066 and the new one is 1333. Downclocked to 1066 is has the same latency as the original one and I've done that countless times on other laptops and desktops. Bootcamp is working fine with W7 X64. The ram is recognized correctly and no issues.

    However, Lion doesn't boot at all (freezes on the loading screen). Same happens with the recovery partition.

    EDIT: If I use 1 of my old sticks with 1 of the new it works fine. Does that mean OS X can't downclock RAM by itself? I was pretty sure this was handled by the CPU Chipset itself...

  2. #2

    Member Since
    Mar 09, 2011
    mbp 15 2009, mbp 13 2010
    ram chips are sensitive to apple mbp, if it gets confused, it does weird stuff, better stay with your dedicated number. check see the right chips for your mbp.

  3. #3

    Member Since
    Jul 18, 2012
    Yeah just did some reseach. The MBP 13'' Mid 2010 EFI can't downlock RAM on its own. Utterly stupid. It's working on Windows.... I've tried flashing the RAM to 1066 but this model is write protected. Meh. Just lost 20 shipping bucks on a totally stupid design choice.

  4. #4

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    iMac, i7 4GHz, 32GB memory, 1TB Blade Drive, OS X.13.5
    As a suggestion check out a Mac supplier such as OWC, get the full description of the memory modules, and shop around.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

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