5900x fclk 1900 seems to work for me, i only tested cinebench, play a bit of conan exile and ran the red dead 2 benchmark no crashes
ram are these 4x8 https://www.microcenter.com/product/...C16U4W_-_White
set it to xmp and then raise the clock to 1900/3800
no changes to voltages etc or anything.
asrock x570 taichi