Finally there's DDR4 chips available that, configured to 128 bits, c.f http://fudzilla.com/news/memory/38505-g-skill-shows-ddr4-4266mhz-memory-at-idf-2015, can match the bandwith of the current 256-bits DDR3 configuration used in Xbox One.
When porting the xbone apu to 14nm, is it likely that...