The RX 470 or 570 hashes between 900 and 1000 h/s.

You only need the right BIOS and the new amd driver.
Then set the rawintensity to 896, worksize 8, 2 threads (sgminer or gateless gate sharp).

My RX 470 hashes ~930 h/s XMR @1150/2050, 80W on the wall.

That´s it !