MacBook (Unibody) and 8 GB RAM

Discussion in 'MacBook' started by anotherimacuser, Jan 15, 2014.

  1. anotherimacuser macrumors newbie

    Jan 11, 2014

    I've bought a 8 GB RAM upgrade for such a machine. However, it is not working. As described at and it should be working. If I put only one 4GB module in the MacBook, everything works fine. But if I put both 4 GB modules in the MacBook, only few seconds it can be used. After a very short while after starting, the system is freezed. No mouse pointer can be moved and so on. However, during a short period I was seen, that the system displayed the installed 8 GB RAM. Here are the data from the system (running with a 4 GB module and a 1 GB module is also working fine):

    Model Name: MacBook
    Model Identifier: MacBook5,1
    Processor Name: Intel Core 2 Duo
    Processor Speed: 2 GHz
    Number of Processors: 1
    Total Number of Cores: 2
    L2 Cache: 3 MB
    Memory: 5 GB
    Bus Speed: 1,07 GHz
    Boot ROM Version: MB51.007D.B03
    SMC Version (System): 1.40f2

    I use OS X 10.9.1.

    Is there a hint how I can use 8 GB RAM with this machine?
  2. allthingsapple macrumors member

    Dec 27, 2013
    Try a Pram and a SMC reset to see if that helps matters. Clean out the ram slots too and also make sure the ram is seated properly.
  3. brdeveloper macrumors 68020


    Apr 21, 2010
    Is this really a Unibody Macbook? I say this because the first Unibody one had 2.26GHz and not only 2 GHz. Pre-unibody Macbooks support up to 6GB from what I know.
  4. MultiFinder17 macrumors 68000


    Jan 8, 2008
    Tampa, Florida
    The original Aluminum Unibody MacBooks ran at 2.0GHz and 2.4GHz. You're thinking of the original white plastic Unibody MacBooks, which did indeed run at 2.26GHz.
  5. anotherimacuser thread starter macrumors newbie

    Jan 11, 2014
    thanks for the ideas. However, nothing helped: with 5 GB of RAM (1 GB and 4 GB modules) the machine works nice, but with two modules of 4 GB it is not possible to use the machine for at least 5 minutes :(
  6. bradleyjx macrumors member

    Jul 7, 2008
    Madison, WI
    The two things I'd do/check here: (I was able to successfully do this back in ~2010ish)

    - See if you can re-install the firmware version that is linked to from the first article.
    - Make sure that it isn't a RAM issue with one of the sticks - run each stick for a few minutes of hard use with the other 1GB module, to make sure that you just aren't dealing with bad RAM.

    Also, just to cover bases, what kind of RAM did you buy?
  7. anotherimacuser thread starter macrumors newbie

    Jan 11, 2014
    I did not find a firmware restauration cd for my MacBook. The RAM works fine separately. However, it was a cheap offer.
  8. TheGrandMoff macrumors newbie


    Jan 16, 2014
    You can get it to work.

    I have the exact same model, unibody macbook from 2008. I installed 8Gb of ram in 2012 and it has been working great. Sounds like the Ram may be questionable if you already tried the above suggestions.
  9. Altemose macrumors G3


    Mar 26, 2013
    Elkton, Maryland
    If it works fine with one RAM module but not with both. Try starting it with the other 4 GB stick and running hardware test. It may be that the other stick is defective.
  10. Munkypoo7 macrumors 6502


    Oct 24, 2011
    Miami, FL
    Really dumb question, as an owner of a Late 08 Unibody Macbook as well.

    What speed RAM did you purchase? Hopefully it was 1066.

    Most kits are 1333 (or greater), which if used in conjunction with a 1066 stick (that would be your 1GB stick), the 4GB 1333 stick will downlock. Making it work properly.

    However, if you insert two 4GB modules that are 1333 respectively, then they'll try to run at that speed, and for some reason the late '08 Macbooks cannot automatically downclock them to 1066 and make them work... this would be why they aren't playing nice with your laptop.

    For what it's worth, I just upgraded my Macbook with this kit, works flawlessly :)
  11. anotherimacuser thread starter macrumors newbie

    Jan 11, 2014
    The solution was: using other RAM. The same specification. However, the first (cheap) RAM was advertised as "working with MacBook". I was able to give the RAM back. Now I have RAM advertised "100% warranty working with MacBook" and "10 years warranty". And it works :)

Share This Page