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2018 refresh of the Apple Mac mini. Processor options include 3.6 GHz quad-core Intel Core i3, 3.0 GHz 6-core Intel Core i5, and 3.2GHz 6-core Intel Core i7 processors.

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Mac mini 20187 64GB Ram Upgrade only showing 32GB!

Hello

i just purchassed a set of 2x 32GB Ram, i have installed the ram on the mac

but in the mac info tab it’s only showing 32GB and only one memory slot used the other one is empty

do you have any idee how to fix this ?

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here’s the the ram i’m using : https://www.amazon.com/DATARAM-2666MHz-P...

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While this is a pain to do, you’ll need to remove one of the SO-DIMM’s to see if you can isolate out which SO-DIMM is not working. Then take the working SO-DIMM placing it into the other slot and then test again.

Either one of the SO-DIMM’s is bad or one of your sockets is bad.

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Does anyone know which how the slots on the board ( A and B) correspond to the slots displayed in the GUI (1 and 2)? I am having the same issue and already swapped once, slot on the left of GUI remains “Empty”.

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UPDATED GUI left slot = BANK 0/ChannelA-DIMM0 on my machine.

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I would look at the System Report > Memory then expand the memory slots and post a snapshot here for us to see as I trust it more than the GUI.

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Thanks for the help Dan. According to system report it's BANK 0/ChannelA-DIMM0

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@loader - Did you try swapping the SO-DIMM over from the working side to the other side? to see if its the SO-DIMM you had was bad or the socket.

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@danj yes I tried that. Hoping I either messed up and put them back in the same slot OR I did not fully insert the DIMM. It took about 40 mins and before I make a third attempt wanted to fully understand which DIMM the issue was.

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@loader - So you have which a bad SO-DIMM or a bad slot?

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I had the same problem (didn't recognize one of the aftermarket [Samsung] RAM cards) and tried 'reinstalling' the cards with no luck. As a last effort I tried doing the diagnostic (holding D at startup) which reported no problems - but when it booted up it recognized the other card!!

(it’s at least easier than taking the machine apart again; and also may just be a good idea to do any time you install new RAM to force the machine to recognize it?)

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I love the simple solutions! They are usually the right one.

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