Pairing Memory: Match BANKs or DIMMs

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

  1. wdr1 macrumors newbie

    Sep 12, 2014
    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


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

    Jun 13, 2015
    each bank should have 12 GB.

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

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