![]() Your iMac performs a memory initialization procedure when you first turn it on after upgrading memory or rearranging DIMMs. Reconnect the power cord 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 install 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 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. ![]()
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