I have look around and I have not been able to find much memory vs the infinity fabric in AMD Zen, Zen+ amd Zen 2 processors.
With Zen 2 I found the infinity fabric maxed out at 1600 Mhz which makes DDR4-3200 the ideal speed for memory to achieve the maximum performance of the hardware.
So my R5 2400G is Zen+ but I am not sure what the max speed of the infinity fabric, nor am I able to find out the ideal speed is for Zen (1000 series).
perhaps somebody from AMD can help clarity this because otherwise I will stick to buying the cheapest memory