What I am saying is the BEST speed for ram is to match IF 3733mhz. Never said it's required and in Ryen3k, you can decouple the memory speed but it will degrade your performance. Anything beyond 3733 will be a diminishing return scenario in real world performance.
https://www.pcgamesn.com/amd/ryzen-3000-memory-overclocking-sweet-spot
I know what you’re saying. What I’m saying is IF will be matched below 3733. IF is only officially rated at 3200 so 3200 memory will run IF at 3200 so you don’t need 3733 and you don’t need to decouple. In my case I can’t even get IF to 3733 without raising voltage and I’m not alone.
Now I’m not necessarily disagreeing with your memory suggestion. I’m just saying running below 3733 will not decouple the IF it will still be 1:1 and that you may not even be able to get to 3733 at default settings, so I wouldn’t be terribly concerned if you don’t get 3733 memory.