iMac (Retina 5K, 27-inch, 2019) DIMMs have a notch on the bottom, slightly left of the middle:.If your DIMMs are mixed in capacity, minimize 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 left of the middle.Find your model below for specific installation instructions and notch locations: When you insert a DIMM, make sure to 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 oriented 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.
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