

After you've inserted it, press the DIMM up into the slot.Insert your new or replacement RAM SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown above.If you're replacing a memory module, untuck the tab and pull it to eject any installed memory module: Untuck the tab in the memory compartment.Using a Phillips screwdriver, remove the RAM access door in the bottom of the computer:.Tuck the tabs above the memory DIMMs and reinstall the memory access door:Īfter your iMac has cooled down, follow these steps:.There should be a slight click when the memory has been seated correctly: Insert your new or replacement SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown below.If you're replacing a memory module, gently pull the tab to eject any installed memory module: Remove the access door and set it aside.Using a Phillips screwdriver, remove the RAM access door in the bottom of your computer:.Make sure you allow the memory initialisation process to be completed. This process can take 30 seconds or more, and the display of your iMac will remain dark until it's finished. Your iMac will perform a memory initialisation procedure when you first turn it on after upgrading memory or rearranging DIMMs. Reconnect the power cable and all other cables to the computer, then start up the computer.

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 lock 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 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 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 with 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 be inserted fully:

