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If it was all about battery savings, then why not use DDR4? DDR4 is more power efficient [1]

[1] http://www.memcon.com/pdfs/proceedings2013/track2/Designing_...

Your link compares DDR4 against DDR3, but you should be comparing DDR4 against LPDDR3.

Why not LPDDR4 against LPDDR3? LPDDR4 is also more efficient and has better density.

Skylake does not support LPDDR4, nor does Kaby Lake (except with their ultra-low power chips).

I don't think we're going to see 32 GB RAM in the ultrabook category until LPDDR4 is supported by Intel in their mobile-class processors.

Edit: AnandTech suggests that LPDDR3 is 25-30% more power efficient than DDR4. (http://www.anandtech.com/show/6326/additional-details-on-mic...)

That might be so, but the macbook air is the ultrabook series and the mac book pro should be the work horse series.

I have a Dell Precision 5510 that supports up to 32GB of RAM and also has Skylake Mobile Xeon. Alas, it is plagued with tons of issues.

Cost. Margins. Their current price point is already an increase. Not sure what using DDR4 would do to that but presumably newer tech translates to higher costs.

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