Ryzen 5 Ram Question

Almost ALL Ryzen motherboards support at least 3000mhz memory modules now, BUT, you will need to update to the latest bios on most of them unless you get one that had a revised and recent bios version already installed from the factory. Best advice is no matter what, check your bios version against what is available on the manufacturers product page. If there is a newer version, install the latest one. That will help to maximize compatibility with the broadest range of memory modules and memory speeds.

Even if I could only get a module to run at 3000mhz, I'd STILL buy a 3200mhz module, at least, because it will help to ensure that at whatever speed it does run stably at it does so more easily and also allows you a bit of room to play with settings. Generally they will also run at faster speeds without having to increase voltage by much, or at all, in order to get them to do so. If you want to run at 3000mhz, just as an example, and you buy a 3000mhz module, you will probably stand at least some chance of needing to bump up voltage and/or overclock the CPU at least a little bit to get them to run at that speed. If you buy a 3200mhz module, that was tested for that range, you are less likely to need to make voltage changes or overclock the CPU in order to get the memory to run at 3000mhz fairly easily.

Buy the fastest memory module you can afford in the quantity you plan to ever need, at the same time, in a matched set, so that there are no compatibility issues created if you try to add unmatched memory later and find that some small changes to the module design, even if the part number is identical, turns out to cause problems. Of course, if there is a very large price difference between otherwise similar modules only because of the faster speed, then just buy the speed you intend to run them at. No sense paying a lot extra to be able to just get advertised speed anyhow.

Much like buying a car that will be used mostly on the freeway. You want one with tall gears that can 175mph easily, even if you only ever plan to be driving 75mhp, rather than a car that has to struggle to maintain the 75mph you mostly want to drive at because the design is such that they only put up to 95mph on the speedometer due to it being only a four cylinder gas sipper. Ok, not the best analogy, but I think you get the idea.