I would not agree that the best answer is to consult Apple, since Apple is famous for not letting ppl know, how their devices actually work. You see that already in the short portion, Dan posted here:
The Maximum memory capacity of these machines is NOT 8 GB. 16 GB works just fine, Apple just never tested it so they never shared this information.
As for DDR3L and DDR3:
I also was not sure, so I tested it:
Both work without a problem, so you can install both.
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As for, if it makes a difference: The Power Rail for the RAM is called "PP1V5S3_DDR", stating is as a 1.5 V rail. I installed DDR3L modules and still the voltage on the rail was 1.506 V. So even though the modules could run on 1.35 V, the logic board always runs them on 1.5 V since that is what it's designed for. This was tested with most recent Catalina update, so with the most recent EFI.
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As for, if it makes a difference: The Power Rail for the RAM is called "PP1V5S3_DDR", stating it as a 1.5 V rail. I installed DDR3L modules and still the voltage on the rail was 1.506 V. So even though the modules could run on 1.35 V, the logic board always runs them on 1.5 V since that is what it's designed for. This was tested with the most recent Catalina update, so with the most recent EFI.
This is not rocket since, but I could not find this definitive answer anywhere on the web, so I checked for myself and posted it here.
I would not agree that the best answer is to consult Apple, since Apple is famous for not letting ppl know, how their devices actually work. You see that already in the short portion, Dan posted here:
The Maximum memory capacity of these machines is NOT 8 GB. 16 GB works just fine, Apple just never tested it so they never shared this information.
As for DDR3L and DDR3:
I also was not sure, so I tested it:
Both work without a problem, so you can install both.
As for, if it makes a difference: The Power Rail for the RAM is called "PP1V5S3_DDR", stating is as a 1.5 V rail. I installed DDR3L modules and still the voltage on the rail was 1.506 V. So even though the modules could run on 1.35 V, the logic board always runs them on 1.5 V since that is what it's designed for. This was tested with most recent Catalina update, so with the most recent EFI.
This is not rocket since, but I could not find this definitive answer anywhere on the web, so I checked for myself and posted it here.