![]() ![]() 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. 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: Remove a DIMM by pulling the module straight up and out. Note the location of the notch on the bottom of the DIMM.After the memory cage has been released, pull the memory cage levers towards you, allowing access to each DIMM slot.Push the two levers outwards to release the memory cage: Locate the two levers on the right and left sides of the memory cage. A diagram on the underside of the compartment door shows the memory cage levers and the orientation of the DIMM.Remove the compartment door and set it aside: ![]()
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