Heads up for z690 Strix d4 bios 812 is a mess for 2x8 b die. It makes no sense to me as 812 is best bios for me with DR b die.
Issue is with rebooting. Settng that boot on 2x8 will blue screen the next boot. Didn't spend a lot of time testing. Just a heads up. It may work for you, didnt for me...