Stefan Mileschin

Over the past couple months, we've come to understand that memory speed and latency plays a major role in Ryzen CPU performance. Higher speeds and lower latencies are desirable for getting the most out of a Ryzen chip. Outside of a few motherboards with external base-clock generators, however, the memory multipliers for Ryzen CPUs have maxed out at 32. With a 100-MHz default base clock, that means builders have been limited to running overclocked RAM at DDR4-3200 speeds.

http://techreport.com/news/31974/ryz...ocking-options