This of course is in spite of the marketing efforts of G.Skill and others who constantly try to convince people that they need the highly over-priced, huge profit DDR3 RAM, which they do NOT. Just because some Intel CPUs can run the RAM at high frequency does not make it practical or necessary.
In addition DDR4 will NOT be cheaper than DDR3 and it will NOT provide any tangible performance gains for desktop PCs over DDR3. DDR4 is designed primarily for servers where it can show some performance improvement but at a high cost. Unlike with DDR3 where you can add RAM as you desire with DDR4 you will be required to replace ALL of the RAM if you want to increase the system capacity.
A technically educated PC enthusiasts doesn't get duped by the marketing hype from RAM makers or purveyors of crap PC hardware.