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  1. #1


    Member Since
    Oct 31, 2009
    Posts
    1
    Memory upgrade: a stange mix of symptoms
    As so many others have, I tried to upgrade my memory from the standard 1gig to 4. According to Crucial memory's system checker, the machine is a MacBook 2.1GHz Intel Core 2 Duo (13-inch White) MB402LL/A.

    The existing memory is 667mHz, 2x512mb. The new memory is 800mHz, 2x2GB.

    When I install both of the new sticks, the computer will not boot. No grey apple screen, just fan noise and the dvd drive checking-noise, then nothing. If I try one of the new sticks by itself, same result. This is true for both memory ports and both sticks. I thought maybe they weren't seated correctly, so I tried switching them and re-seating, both were ineffective whether I was trying one new stick alone or both together.

    However, if I try one old stick with one new one, the computer boots and functions just fine. I tried this with both of the new sticks to make sure that neither was defective; both work fine. When I do this, the system profiler reports that both the new and old stick are running at 667mHz, even though the new stick is capable of 800.

    Now, I've seen some forum posts indicating that older machines can only work with 667mHz memory, but why would it boot without problems when I mix one 800mHz with one 667? Also, is there a way to downclock the 2 new ones to 667?

  2. #2

    Dysfunction's Avatar
    Member Since
    Mar 17, 2008
    Location
    Tucson, AZ
    Posts
    6,877
    Specs:
    Way... way too many specs to list.
    Contact Crucial, have them send you new ram.
    mike
    This machine kills fascists
    Got # ? phear the command line!

  3. #3


    Member Since
    Nov 27, 2008
    Posts
    81
    Specs:
    MacBook Pro 17" LED-Backlite display, 2.5GHz Intel Core 2 Duo, 4GB memory, 512MB VRAM, 320GB HD
    In my experience, you always want to replace your memory with the *exact* specs of your current working memory. If this is not done any number of weird issues can result from it (as I have seen). If I were you I would just purchase 2x2gb@667 from newegg..

    I've had good experience's in the past with Mushkin for macs...

    Newegg.com - Mushkin Enhanced 4GB (2 x 2GB) DDR2 667 &#40C2 5300) Dual Channel Kit Memory For Apple Model 976618A

  4. #4

    Dysfunction's Avatar
    Member Since
    Mar 17, 2008
    Location
    Tucson, AZ
    Posts
    6,877
    Specs:
    Way... way too many specs to list.
    I'm not sure he needs to go buy NEW ram when Crucial will simply replace the ram he has with the correct 667mhz ram with a simple phone call.
    mike
    This machine kills fascists
    Got # ? phear the command line!

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