I've just noticed the X470 Prime Pro is rated up to 3600MHz. That's something new they've added!
I'm tempted with an upgrade, but cant really be bothered with a rebuild.
Also I thinks it very short sighted as I imagine next years chips although compatible with current boards will be quite different to today's chips.
More of a tick rather than a tock.
Don't bother upgrading, existing X370 motherboards should all handle similar speeds.