

Place the computer in its upright position.You don't need to press the compartment door release button when replacing the compartment door. After you've installed all of your DIMMs, push both memory cage levers back into the housing until they've locked into place:.iMac (27-inch, Late 2013) and iMac (Retina 5K, 27-inch, Late 2014, Mid 2015, and Late 2015) DIMMs have a notch on the bottom right:.iMac (27-inch, Late 2012) and iMac (Retina 5K, 27-inch, 2017) DIMMs have a notch on the bottom left:.

iMac (Retina 5K, 27-inch, 2019) DIMMs have a notch on the bottom, slightly to the left of the centre:.If your DIMMs are mixed in capacity, minimise the capacity difference between Channel A (slots 1 and 2) and Channel B (slots 3 and 4) when possible. iMac (Retina 5K, 27-inch, 2020) DIMMs have a notch on the bottom, slightly to the left of the centre.Find your model below for specific installation instructions and notch locations: When you insert a DIMM, make sure you align the notch on the DIMM to the DIMM slot.
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Replace or install a DIMM by setting it down into the slot and pressing firmly until you feel the DIMM click into the slot.When reinstalling DIMMs, the notch must be orientated correctly or the DIMM won't fully insert:

