we max out at an average of roughly 70 Degrees C, this is based on Kraken X62 cooling.
try a -.05v offset (this was basically mandatory for the 3900x), it's worked wonders for other zen 2 cpus, the problem is that stock voltage itself is often too high, and with 16 cores, getting rid of a bit of excess voltage that you won't need keeps it cool and cuts down the power bill tremendously.