I have 16GB of RAM installed on my iMac 27" 5K i7 2017 (2 x 8GB).
There are 4 slots in total and I would like to add another 16GB.
I don't know if it's best to buy 2 x 8GB or 1 x 16GB?
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After reading the posts that @bmike posted I made up my mind and I'll opt for one module of 16GB and I'll have one memory slot still available just in case.