24GB RAM in Retina iMac - Matching?

Discussion in 'iMac' started by Alchemist, Oct 20, 2014.

  1. Alchemist macrumors regular

    Alchemist

    Joined:
    Dec 22, 2004
    Location:
    UK
    #1
    Hi all.

    I purchased a Retina iMac 5K and have basically tricked it out - 3TB Fusion, CPU upgrade, GPU upgrade. I have however ordered it with stock RAM with the intent of upgrading it using third party RAM.

    My question is this. Will buying a 16GB kit (2 x 8GB) and installing that alongside the existing 8GB (2 x 4GB sticks) be non-optimal? Is it better to have a machine with all the same sized sticks or does it not matter as long as you have matched 'pairs'? I may in time upgrade to 32GB, but at this stage I'd like to give 24GB a whirl and save myself some money after what is quite an expensive purchase.

    Insight appreciated!
     
  2. boto macrumors 6502

    boto

    Joined:
    Jun 4, 2012
    #2
    Yup, 24GB is fine as long as the modules are matching pairs. Just fill in the remaining sockets when you receive the machine and it will work perfectly. Just don't place them side by side module A, B, but A, C.
     
  3. tkwolf macrumors 6502

    Joined:
    Apr 11, 2012
    #3
    Is this going to work with the new iMac though?
    [​IMG]
     
  4. jacktorrance macrumors regular

    Joined:
    Jul 21, 2009
    #4
    Yes.
     
  5. pasadena macrumors 6502a

    pasadena

    Joined:
    Sep 12, 2012
    Location:
    Socal
    #5
    I've seen that a few times... what's the technical reason to do this ?
     
  6. Zwhaler macrumors 604

    Zwhaler

    Joined:
    Jun 10, 2006
    #6
    Then each "set" of 2 sticks is equal... has to do with the channel configuration I believe.
     
  7. Alchemist thread starter macrumors regular

    Alchemist

    Joined:
    Dec 22, 2004
    Location:
    UK
  8. pasadena macrumors 6502a

    pasadena

    Joined:
    Sep 12, 2012
    Location:
    Socal
    #8
    Thanks
     

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