So desktop class memory (plainly spoken DDR4) would be the only option if they wanted to go past 16GB. LPDDR4 is not supported by Intel’s CPU, and the DDR4L (another low voltage RAM type) standard is not finished yet. All DDR3 memory types are restricted to 16GB. How is this possible? That is because there yet another RAM standard, known as LPDDR3E (E for enhanced) RAM, that does go up to 1866Mhz. However, LPDDR3 only goes up to 1600 megahertz in speed, but Apple uses 1866Mhz 2133MHz RAM. The Intel chipset being used supports the following kinds of RAM: DDR3 RAM, Low Power DDR3 RAM (LPDDR), and DDR4 RAM. While this gives a good indication of the reasoning, let’s dig deeper: I hope you check out this new generation MacBook Pro, it really is an incredible system. To put more than 16GB of fast RAM into a notebook design at this time would require a memory system that consumes much more power and wouldn’t be efficient enough for a notebook. The community reaction was strong enough to elicit a response from Phil Schiller: Then to much disillusionment its biggest limitation became clear: that it has a 16GB RAM ceiling on all of its models. To much fanfare the MacBook Pro was released.
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