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Tried the block chain driver and that doesn't change the hashrate.You can use a blockchain driver. But few recent standard AMD gpu drivers that came out in the past two months have that compute switch and you'll get the same thing, DAG issue fixed and couple Mh/s back. But that will not get you to 29-30Mh/s. 22.4Mh/s is ok I guess for 1750Mhz memory clock and non modified bios.