Both statements up are not true for ryzen I have F4-3200C14D-32GTZ which is B-die and it works with 3200mhz cas 14 with good timings (with cmd 1T), AIDA64 read = write = copy 49.9GB/s with latency 70.5ns. with Hynix there could be problem but not as big as they mentioned up.
I will use same RAM for C7H WIFI and 2700x not sure whether I will have any problems.
Well, dont know exactly why my cpu is boosting up to 4.741 even on all cores... and 4.45 most of the time when boosting.
Also manage to get the RAM to work at 3600mhz
16-16-16-16-35-58 2T 1.425v till now it seems stable.
You might have better performance with the memory at a lower clock. You should read this article: https://www.io-tech.fi/artikkelit/ddr4-muistinopeus-ryzen-2n-suorituskyky/