Samsung memory usually can only be 2000mhz max, sometime can be 2050mhz. More than that, you will find a lot of error using hwinfo.
Try this, set core clock to 1150, mem 2000, ref 30. And you will get 30+ mhs.
i tried it but my hash went down to 26mh/s, ref above 20 doesn't make any change and 2200mhz gets 28mh/s as long as the ref is 20, i'm using the latest amd driver 21.2.3 could that be the cause of low hash?
Perhaps this version of TRM is not adapted for the latest AMD drivers, you better go back to the version, for example 20.5.1 I use it myself and everything is ok