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I just put more Ram into my late 2015 iMac 27" retina for a total of 48 GB (Two 16 GB and two 8 GB chips)
I'm not sure I arranged them correctly. Could someone please look at my attachment and tell me if I got it right? Thanks, Carl
iMac 27″, macOS 11.6
The 2020 RAM slots are wired differently than the earlier 27" models.
It doesn't matter as much with the earlier models (ie your Late 2015), but the RAM models should be staggered with the !6GB modules in 1&3 or 2&4.
Plus if you go to Apple > About This Mac > System Report... > Memory you can actually see and confirm which modules are on Channel A & B.
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I just put more Ram into my late 2015 iMac 27" retina for a total of 48 GB (Two 16 GB and two 8 GB chips)
