Is it LPDDR3 or LPDDR3E RAM being used?
Is the 1866Mhz RAM used in entry 13 inch function keys MacBook Pro enhanced RAM like the touchbar MacBook Pro?
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Apple is using LPDDR3E memory across all three of the systems. Here's the memory specs: Hynix LPDDR3E RAM
Basically, LPDDR3 offers 1600 Mbps where as the LPDDR3E offers 2133 Mbps of throughput and is low power as well.
I'm surprised Apple didn't use Rambus RAM if power was such an issue. Here's their spec sheet: R+LPDDR3 DRAM.
Also to clearify things here Intel did not qualify 32 GB RAM as an option with the CPU Apple is using with LPDDR3E. I suspect there is a timing issue that maybe the limiting factor in the CPU series. As you can see there is 32 GB options for both vendors.
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