Hi!
I bought new cards Rx 580 8gb with different vendor Armor + gaming x + sapphire, But never ever reach more than 24 mh/s even I moded GPU ROM
where is the problem and what should I do?
You need to install gpu-z, and of course afterburner last one. Slowly overclock step by step.
And of course you need to install blokchain driver from amd or custom maded for dag fix.
In any case weed more info to help you.