Can anyone please send me a link of a Bios or how to set one up? My RX 580gb hash is 1.4 mhs and it is a disaster. Using Tdxminer on HiveOS with stocks settings.
you need to download BIOS from you card, edit 4 fields raising them by 25% (for example) and flashing BIOS back. above given link to raise PL in hive OS - everything is there 
done only that I raised hashrate from 2.2-2.5 to 3-3.1 on rx470/rx570 4gb
but if you have a strong undervolt in BIOS, you may also have to raise voltage, in my case, only memory timings were simply stitched for ETH