You can configure it with up to 64gb from Apple, but it supports up to 128gb.
What do you think will happen if you put 32 GiB DIMMs in and you call AppleCare about a hardware problem? How about "<click> <dial tone>"?
"Supported" means that you can call Apple and get "support" if there are problems.
Apple does not support 32 GiB DIMMs at this point in time, even if some of them might "work" in the system.
And, of course - whatever the density, the Dell has 8 DIMM slots and should work with twice as much RAM as the Apple with 4 DIMM slots. How anyone can take issue with my "new Mini Pro supports 64 GiB" table without realizing that is mind-boggling. Clearly a failure in primary school mathematics education.
You can always take a look here.
How 'bout that - Phil says 64 GiB, just like the Apple Store.
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