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 performance : r/overclocking
Super Talent Speed Series Internal Memory 4 GB / 2200 MHz, 2 x 2 GB) DDR3–RAM Kit 2 : Amazon.co.uk: Computers & Accessories