DDR4 memory has eluded us for a while, but it seems the next-gen RAM should hit us in 2014, but not for the mainstream consumer market. It seems we should expect the new memory in the high-end Haswell-EX 4-socket platform, with each chip capable of sporting 16 or so cores.
These insanely high-end chips are capable of upward of 60 cores on each four-socket motherboard, will definitely impress most people. DDR4 will bring along with it lower power consumption with 1.2v power supply, as well as better parity protection and recovery from errors. Will we see DDR4 on the desktop side, and not server side in the same year? Probably not.
Both the 22nm Haswell and its 14nm Broadwell successor should share the same LGA1150 socket, thus, supporting DDR3 memory only. DDR4 support will most likely arrive with their 2015 successors, and a new micro-architecture at that time. This means we'll experience a one-year gap between the high-end and low-end for the new generation of memory support.
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