if i know it correctly any DDR4 2133 and 1866 mhz ram is normal ram for any cpu and motherboard. Anything higher is OC and has to be changed in the bios of the motherboard to utilise it. Go with whatever you want, but remember, the motherboard has to actually support the OC ram, so yeah. The mobo will say what rated OC ram it can take, so any between and lower that works works. Just remember, the faster the ram the higher the price.
With that setup higher is better, I believe
Hopefully someone with more experience can give you a more comprehensive answer
OR in the
words of Linus, "It depends"
until