How do you get 8000Mhz on gigabyte board if VDDIO is limited to 1.4v?

I was able to get 8000C36 (24GBx2 M-die) on asrock a620i: https://imgur.com/a/gtf2VED (VDDIO=1.45v VDD=1.52v VDDQ=1.5v)

However the same setting does not work on gigabyte b650i, as VDDIO is capped at 1.4v (which is ironic as I'd assume a620i -> b650i would be an upgrade).

So is VDDIO=1.45v considered unsafe? and how do people get M-die working at 8000Mhz on gigabyte boards…