Keep in mind, I'm still working on it, can't say for sure that these are optimal or even 100% stable!
So here are the setting:
DRAM freq - 2400MHz
DRAM - 1.70v (I think that 1.65v would also be ok)
VTTDRAM - 0.865v
VCCSA - 1.350v
VTT CPU - 1.350v
CPU PPL - 1.865v
DRAM Current capability - 130%
(Actually not sure about VCCSA and VTT CPU voltages, haven't understand their impact jet, there was no such settings on x58 chipset (there was uncore only))
I also use extreme mem power phase and forced 450Khz voltage frequency.
BTW Ripjaws memory has 2T Command Rate in all XMP profiles, I guess you should set it so.