HELP make adie 8400mhz stable on ROG STRIX X870-I

[DCW]

I use the same cpu and memory kit can run 8400mhz on MSI B850i.
It only take 1.05 vddp and 1.4 vddio.It even take 1.0 vddp and 1.35 vddio with AIO can run stable.
But i cant make it stable on ROG STRIX X870-I.
btw, I didn't mean to mention other brands

[Vynra]

Those boards are pretty equal. Probably different voltages in other areas. 

 If you are on the latest bios try flashing back to an earlier version. If you are not on the latest bios try updating. If those don't work you need to up voltage and tinker.

[DCW]

I have tried to voltage.But it doesn't seem to be very useful

Actually, I successfully passed the MT100 on 1.1 VDDP and 1.5 VDDIO.
However, I think this is the result of memory training because after I adjusted and retrained it, it no longer passed the test