eat your DDR4. my DDR3 does 2200mhz cl 10-13-13-38. yes, cl10! the trick is to ignore reddit and just put the voltage higher than what they say is safe, you'll get better
DDR3-2200+ with Core i7 860/870 processor
16GB G.Skill DDR3 PC3-14900 RipjawsX Series for Intel Z77/Z68/P67 (10-11-10-30) Dual Channel kit