>"However, LPDDR3 only goes up to 1600 megahertz in speed, but Apple uses 1866Mhz RAM. 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."
Probably because its single channel. They bump voltage and freq to catch up in performance.
If they would choose 2x16 and lower freq, voltage resulting performance would be even better with similar power usage.
Apple prefer to make more money. They use power of brand to sell overpriced products to clueless crowd. Just go apple store to see audience, most people there do not even know what is RAM.
Why does apple claim 2133Mhz?