BTW if you want to know for sure what memory is compatible with Ryzen and at what timings this is a great page on AMD site (it lists both JEDEC and XMP timings):
If you're dead-set on going for JEDEC, then by all means go for it
What I would
strongly recommend however is to get any ram, with a serial number listed on that page, that can do 3600 MHz with XMP. On 99% of the motherboards these modules will just be plug-and-play (you just have to enable XMP). When running on JEDEC timings you'll leave the processor's fabric clock (FCLK) running at 1600 MHz (instead of 1800 MHz) leaving considerable perfomance on the table. Besides JEDEC 3200 Mhz modules are notoriously hard to find and relatively expensive.
I would recommend kits with Micron E-die (as they are usually cheap and work well) or Samsung B-die (if you can still find it but not produced anymore).
If you want to search memory to buy based on the serial number listed the first link, this search here helps immensely (just insert it into the search box on the right):
Example build:
Last year I built a Ryzen 3600 + Tomahawk B450 MAX rig to a friend with
these ADATA XPG Gammix D10 modules (AX4U360038G18A-DB10 to be exact, though any AX4U360038G18A would do as it's either Samsung B-die or Micron E-die, see AMD's link). All I All I had to do was enable XMP and has been working like a charm since.
AX4U360038G18A is available and quite cheap on pcpartpicker (but there are multiple other modules that would also work well). Anyway just buy 4x8GB modules and you're good to go. 4 modules might seem odd, but extra ranks actually add performance on Ryzen 3xxx series (see
my 3700x with 4x8GB (E-die) vs 2x8 (B-die) in geekbench as a reference).