I have been lead to believe, via searches and videos, that when dealing with a GTX 1070 or below RAM Speed stops mattering as much but Lowering the Timing gets you solid gains in FPS.
I would imagine it's the opposite on ryzen. It is certainly the opposite on my 7700k system with a 1060. I have RAM advertised at 3200mhz CL16-18-18-38, I can do 3000mhz stable CL14-15-15-34 totally stable. I tested both configurations in several games and noticed 3-5fps decreases on average when at 3000mhz despite the tighter timings, using games known to care about RAM speed such as fallout 4.
I would imagine it's the opposite on ryzen. It is certainly the opposite on my 7700k system with a 1060. I have RAM advertised at 3200mhz CL16-18-18-38, I can do 3000mhz stable CL14-15-15-34 totally stable. I tested both configurations in several games and noticed 3-5fps decreases on average when at 3000mhz despite the tighter timings, using games known to care about RAM speed such as fallout 4.
Since the memory controller moved off the mobo and into the cpu, timings have become almost irrelevant. Timings now are more about stability at rated speeds than anything else.