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It is evident, Apple only officially supports up to 32 GB of DDR4 Memory. It is suggested on every other website this is the maximum memory configuration. However, OWC has photo evidence of 64 GB of memory working within this model. I was wondering if anyone else has attempted this with success?
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Lets look at this a a slightly different way…
The 21.5” system has only two SO-DIMM slots so it can only support 32 GB of RAM (each 16 GB)
The 27” system has four SO-DIMM slots which allows it to support 64 GB of RAM (each 16 GB)
So far this is the densest PC4-19200 DDR4 SO-DIMM’s available.
Then there is the ability of the given CPU & PCH is able to support the additional address lines required to support denser SO-DIMM’s
As an example the 2018/20 Mac Mini supports 64 GB using PC4-21300 DDR4 SODIMM’s in its two slots. This RAM SO-DIMM index is located in a different spot which prohibits its use in your system.
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