I just opened the back of my new 2019 iMac 5K and put it in place. Make sure the slots they go into are staggered, so either 1 and 3 or 2 and 4, then fill the other staggered slots with your existing RAM (if you have them). I turned on the computer for the first time and it recognized the memory and gave me 40GB, including the 8GB that came with the computer. Good stuff!
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