Ive got a asus rampage 4 black edition, intel i7 4930k, and want the best possible ram for high frame rate gaming, general amazing gaming. What is the best course of action? People have told me get 4x4 of 16gbs, but what about the mhz, should i get the highest (2800) or 2133, or 2400? whats best for high fps gaming? thanks