I have this same motherboard, and am running G.skill TridentZ5 DDR5 6000Mhz, but just found a 6400MHz kit on Newegg that I have backordered. This G.skill RAM runs perfectly with XMP 3.0 and I am very happy with it. You might want to give it a try, you won't be sorry.
G.SKILL Trident Z5 RGB Series 64GB (2 x 32GB) 288-Pin PC RAM DDR5 6000 Intel XMP 3.0 Desktop Memory Model F5-6000J3040G32GX2-TZ5RK
B.