looks like i am having a the same issue. I have 3 rx 580 8GB cards one hashing at 27.5 and the other two at 22.5. when i try and overclock them i get no result but if i raise the memory clock high enough my mining rig crashes. i also have gtx 1060s 6GB and i can get up to 23.5 just fine. i can use the MSI after burner to raise the hash rate but i can not do that for my AMD cards.
if anyone has a solution
please advise
thank you
It depends on the driver you are using for MSI Afterburner to recognise the cards. For example the latest version 4.5.0 of MSI can recognise the latest Adrenaline driver and also the Blockchain driver differently from previous versions which cannot recognise both. Check which driver are you using and if you see Adrenaline and not Crimson Beta make sure to
1. Right click on empty space on desktop
2. Choose AMD settings
3. Global Game settings
4. Make sure you change from Gpu workload graphics to Gpu workload compute.
Also remodify the bios if you haven't already done so.