. grab atiwinflash2.74 install that version
. save your original bios file to recover if something goes very wrong hehe
. make a copy of your original bios and try to edit it with polaris bios editor there are some around here and on github
. copy memory timings from 1500 into 1625,1750,1900 and 2000 save the modded bios and flash it to the gpu with atiwinflash
. take a look what happend should bring you at least to 27 mh/s eth mining with blockchain drivers dont try this with newes drivers!!!
.. my wife is ringing.... got to go now...
Hey, my memory type is samsung, your steps are the sames for my card PowerColor 4GB RX 470 Red devil?
I have the original timing
https://image.ibb.co/kP7w7x/Timing.jpg