Apparently BF4 loves high speed memory.
Corsair Blog
I think the only game you see a noticeable difference without checking your frame rates all the time is minecraft. Seriously, that thing loves faster RAM.
Haswell - 8pack says it does, makes everything more "efficient" with 1866Mhz being the minimum.
you should be able to OC that to 1866 without even touching the volts![]()