13" MacBook Pro RAM upgrade problem

Discussion in 'MacBook Pro' started by NRZ82, Aug 27, 2011.

  1. NRZ82 macrumors newbie

    Aug 27, 2011

    I was trying to upgrade from 4GB RAM to 8GB in my wife's computer and am getting an odd problem.

    I got 2 x 4GB sticks to put in, but the computer freezes on startup when they are both installed. It also freezes on start up if I install 1 on the new sticks and leave the other port free (tried both sticks). Here is the part that is confusing me, if I use 1 of the old sticks and 1 of the new sticks (for a total of 6GB) everything works fine. I was thinking that the computer was running on just the old 2GB stick, and not picking up on the new 4GB stick but when I looked at the 'about this Mac' screen it says 6GB, and says both are working fine. The computer is also running faster, so it seems like the new stick is working. I also tried the 6GB setup with both the new sticks to see if either was defective, but they both seem to work fine (as long as they are not used together).

    I was hoping that someone could help me understand what is going on here.

    Thank you

    P.S. Please let me know if this is the wrong place for the post and I will re-post in the proper place.
  2. snaky69 macrumors 603

    Mar 14, 2008
    What generation is it?
  3. SandboxGeneral Moderator emeritus


    Sep 8, 2010
    You can also use this link to find out exactly what RAM and how much your MBP will take.
  4. NRZ82 thread starter macrumors newbie

    Aug 27, 2011
    Thanks for the quick responses.

    I am not sure what the generation the computer is. It was bought new in June 2010 from an Apple store, is a 13" MacBook Pro and has a 2.4 GHz Intel Duo. The OS is 'Mac OS 10 version 10.6.8'.

    From what I have read this should be able to run 8GB of RAM (I researched it before the purchase, and just double checked with the link provided). I bought the memory directly from Crucial using the software they have that scans the computer and sends you to the proper product.
  5. SandboxGeneral Moderator emeritus


    Sep 8, 2010
    You can go to the :apple: menu in the upper left and click About This Mac. if you have Lion it will look like this:


    Then click on System Report and you will see this:


    The circled part is your model ID which helps determine what RAM you can get and how much it can hold.
  6. thinkinblue613 macrumors 6502


    Dec 13, 2010
    Planet Earth
    It should work right after installing them... I would suggest putting back the old memory and looking up at the details of your CPU.

    Up until this years Macbook Pro's, all the memory sticks used were 1066 MHz PC3-8500 DDR3 SDRAM.

    Now, for the 2011's.. They're 1333 MHz PC3-10600 DDR3 SDRAM. It could be possible that you got the newer one that is incompatible with your MBP.

    If so, I would return or exchange it with the correct one.

    Let us know how it works out.
  7. Naimfan Suspended


    Jan 15, 2003
    That IS odd.

    First, your computer does indeed support 8 GB of RAM.

    Second, either one of your RAM sticks is borderline bad or one of your RAM slots is working incorrectly. I'd suggest talking to Crucial and see if they can swap out the RAM modules you have and running on 4 GB until you get them. If that doesn't work, I'd suggest taking it to an Apple store and having them run diagnostics.

    From your description, it's almost like one of the RAM sticks isn't working with one of the RAM slots. Hopefully it's just a borderline RAM stick, because I think the RAM slots are part of the main logic board.

    Good luck!
  8. tobystic macrumors newbie

    Jul 29, 2014
    same thing happened to me

    I had the same problem after upgrading from 2x 1Gb to 2x 2Gb to make 4Gb. Apparently the RAMs sold to me weren't knew and I was not aware; freezing and restarting for about 5 times in 24 hours

    I carefully removed the RAMs, took my body spray (in place of methylated spirit or any ethanol) and soft toothbrush. I gently 'washed' the RAMs with it and placed them back about 10mins later

    More than a week and no freeze again!

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