Upgrading ram weird problem

Discussion in 'MacBook Pro' started by whyapplewhy, Aug 6, 2012.

  1. whyapplewhy macrumors member

    Joined:
    Sep 9, 2009
    #1
    So I have a Macbook Pro (mid-2009), that currently has 2x2gb ram in it (4gb). A friend just bought a new macbook with 2x4gb, but upgraded to 2x8gb so he gave me the two new sticks of ram (4gb each).

    When installing the two new ones I have incurred a strange problem. I stick the two new rams in there and try to boot my macbook and all it does it beep at me. I looked it up and it signifies a problem with the ram which was expected.

    Anyways this is where it gets weird, I can leave one stick of 4gb ram in there with one of the 2gb sticks of ram and it boots up to 6gb of rams. I have mix and matched both sticks of the 4gb in both different slots and each works perfectly fine when paired with a 2gb stick of my old ram.

    However, whenever I install both the two 4gb sticks on my computer, it will not boot but only beep at me. I have repeatedly made sure I have pushed them in all the way and installed correctly but it doesn't work.

    Any suggestions?
     
  2. T5BRICK macrumors 604

    T5BRICK

    Joined:
    Aug 3, 2006
    Location:
    Oregon
    #2
    It's possible that your mid-2009 model simply doesn't like running dual channel with the mid-2012 MBP 1600MHz memory.

    What are the specs on the new memory?
     
  3. ideal.dreams macrumors 68020

    ideal.dreams

    Joined:
    Jul 19, 2010
    Location:
    OH
    #3
    I hade the same issue when upgrading my 4GB of RAM to 8GB. Reseating the RAM fixed the problem for me, so I'd give that a try...make sure that the RAM sticks are seated securely.
     
  4. whyapplewhy thread starter macrumors member

    Joined:
    Sep 9, 2009
    #4
    Ok guys I figured it out. My computer runes 1067 MHz and these are 1600 MHz so my computer downclocks the one stick when running it with the 2gb stick. However I think I will just install the old ones in there since it isn't recommended to run it like this.
     
  5. T5BRICK, Aug 6, 2012
    Last edited: Aug 6, 2012

    T5BRICK macrumors 604

    T5BRICK

    Joined:
    Aug 3, 2006
    Location:
    Oregon
    #5
    That makes sense. Just FYI, your computer will probably work with 2 x 8GB 1333MHz memory. My mid-2009 13" MBP does, and it even runs at full speed instead of throttling down to 1067MHz.
     
  6. chrisvee macrumors regular

    Joined:
    Jul 2, 2010
    Location:
    Winnipeg, Canada
    #6
    Happened to me once when installing stock 2010 MBP RAM into a 2009 MBP. Took the sticks out, blew at the slots, and reinstalled them. All good! Dust perhaps? :eek:
     

Share This Page