iMac 2011 RAM question

Discussion in 'iMac' started by gregof75, Apr 10, 2015.

  1. gregof75 macrumors newbie

    Joined:
    Apr 10, 2015
    #1
    Hi,

    I would like to upgrade RAM in my 27" iMac (mid 2011) that has built 2x2GB RAM, can I add 1x4GB and 1x8GB RAm to get maximum 16GB?

    Thanks for your advice!
     
  2. redheeler macrumors 603

    redheeler

    Joined:
    Oct 17, 2014
    #2
    You can, but I generally recommend against not using a matched pair due to a slight decrease in speed.

    ----------

    Maybe add 2x4 GB to make 12 GB?
     
  3. gregof75 thread starter macrumors newbie

    Joined:
    Apr 10, 2015
    #3
    Thanks,

    acctually I bought them already and I have a problem with 8GB RAM by Crucial. Any other configurations work fine, single 4GB works fine, 2x2GB + 4GB, but 8GB seems to be not recognised.
    I have read that PRAM reset might help, can you confirm this or do you have any other advice how to make 8GB RAM working.

    Cheers
     
  4. redheeler macrumors 603

    redheeler

    Joined:
    Oct 17, 2014
    #4
    Unlike the 21.5", a 2011 27" should take an 8 GB (it actually maxes at 32 GB, not 16 GB). A PRAM reset couldn't hurt.
     
  5. Pieterr macrumors regular

    Joined:
    Mar 22, 2015
    Location:
    The Netherlands
    #5
    What type of memory did you buy? Is it exactly this type? CT8G3S1339MCEU
     
  6. gregof75 thread starter macrumors newbie

    Joined:
    Apr 10, 2015
    #8
  7. Pieterr macrumors regular

    Joined:
    Mar 22, 2015
    Location:
    The Netherlands
    #9
    You could return the 4GB one and buy another 8GB one, so that you can use them as a pair.
     

Share This Page