Anything over 1600 is a serious waste of cash. 4x4 for quad channel.
Since I'm guessing you already bought the overpriced board and the chip here is my review of a 2133 64GB set. You can see that running 2133 over 1600 makes no difference in productivity and games. Although I was only allowed one game to use, I can tell you with experience that there isn't a game that takes advantage of more memory bandwidth. I'm currently running this kit at XMP2 which is 1600 1.5v on my 3960x, which is also stock. All benches done at 4.6GHz.
Kingston HyperX Beast 2133 64GB | Bjorn3D.com
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