There is no way they had the Z590 Dark running 5333MHz memory stable before release.
Not doable with BIOS 1.05, or even with the current 1.06 version, it's all BS!
I pulled the Z590 Dark board out of my chassis, it's back on the bench,.. thinking about using it for a doner board and re-cap my old Asus P5E64 WS Evolution board.
Ordered Asus M13A board last week, should have it on Monday.
I was going to skip RL and just cruise with my M12E system till 12th Gen release, but figured 5333, 5600 or even 5866 would be sweet, it will be the last hoorah with DDR4.