so i am screwed again.
MSi afterburner or other software i tried wont let me OC my cards. Either i change anything and as soon as i press apply all changes reset to default, or (on newer drivers) can OC a card, but as soon as i do it others underclock so hard its almost like they are turned off.

I was thinking of bios flashing, but if i am not mistaken, from drivers version 16.2.X there is signature check for card bios...
Thing is, windows wont let me install any drivers older than 17.X.X as it takes them inferior to the default windows driver.
Also, i have red somwhere, that cards with polaris chip - which mine is - requires at least drivers 16.6.X

I have tried to bypass signature check using this guide:
https://bitcointalk.org/index.php?topic=1806196.0
but i failed miserably, it appears, that it cannot be done with these new drivers, wven when i restarted with disabled driver signature enforcement my installation failed because of failed signature check on the atikmdag.sys

do yoiu guys think that some way of overclocking exists for me?