i have an rx480 by MSI (MSi Armor 4gb OC) and im only getting 19-21MH/s

im using the latest crimson relive 16.12.2 driver

im using stock clocks (1291mhz core, 1750 memory)

does anyone have a bios thats UEFI or information on how to flash this particular one, or what tools are needed to do so, and what needs to be adjusted to gain a higher MH/s?

any and all help is appreciated

im mining 19.4mh/s on eth

and 319 MH/s on sia