There you go
Follow this steps in screenshots

-Wattool Setting   http://prnt.sc/ep7nfg , http://prnt.sc/ep7ly0
MODDED BIOS : https://www.dropbox.com/s/p87dtcrv5yh733u/m.rom?dl=0
Wattool download
( http://www.overclock.net/t/1609782/watttool-a-simple-tool-that-combines-overclocking-with-vrm-monitoring-tweaking-for-rx-400-series )

This u will have to keep in start.bat

Wattool commands to write in start.bat

TIMEOUT 2
start WattTool-0.92.exe 1 2 3 4 5 6
TIMEOUT 5

I have sent everything to BuriedONE Blockchain Youtube channel, he will make video for it soon
Good luck