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Adding RAM to my new 27" 2021 iMac

Got a new 27" iMac with 8 gig (2x 4) of RAM in the following slot

Slot 1: blank

Slot 2: 4 gig

Slot 3: blank

Slot 4: 4 gig


I want to add 32 gig of RAM (2x 16). Where should I install the new RAM?


Thank you

iMac 27″, macOS 10.15

Posted on Jun 10, 2021 8:33 AM

Reply
8 replies

Jun 10, 2021 8:55 AM in response to MiguelRivera1914

In order to get the fastest speeds possible the new RAM (both 16 GB DIMMS) should be installed in slots 1 (1 is the very top slot) and 2 which is right below slot 1. The RAM that came pre-installed should be in slots 3 & 4. I did this on my 2020 (there is no such thing as a 2021 27" iMac" they were introduced in 2020) and can provide screen shots that show:


A) My method works.

B) this method shows that it yields the fastest speeds possible.


If you want the screen shot that show this please let me know.

Adding RAM to my new 27" 2021 iMac

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