How could I now undervolt or increase the hashrate on my RX580 (Samsung Memory)? It is going at ~27.5MH/s. Any pointers where I can read about it?
You can either use Msi afterburner or any other gpu software. If you use Claymore Miner, you can use the -cvdcc option to set the voltage. -cvdcc 900 = 0.9v etc