Pairing Memory: Match BANKs or DIMMs

Discussion in 'iMac' started by wdr1, Oct 30, 2015.

  1. wdr1 macrumors newbie

    Joined:
    Sep 12, 2014
    #1
    I purchased an additional 2 8GB ram sticks for my iMac. My intent was to upgrade the original 8GB (from Apple) to a total of 24GB.

    When I opened the back, I noticed Apple had installed a 4GB slot in the 1st & 3rd slot. I thought that odd and would have expected it in the 1st & 2nd. I googled around to see where I should add my additional 8GB cards, but didn't come up with anything. So, I installed in the 2nd & 4th slot.

    Should matching memory sticks be in the same BANK or in the same DIMM?

    I.e., should the 4GB sticks be in BANK0/DIMM0 & BANK0/DIMM1 -- or -- BANK0/DIMM0 & BANK1/DIMM0.
     
  2. redheeler macrumors 603

    redheeler

    Joined:
    Oct 17, 2014
    #2
    My iMac has the same arrangement. I think it's safe to trust the way Apple installed it.
     
  3. jerwin macrumors 68000

    Joined:
    Jun 13, 2015
    #3
    each bank should have 12 GB.

    Install new sodimms in the empty slots (2 and 4.)
     

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