Word of caution when doing all of this.
When I first loaded my brand new xfx 480s into my PC, GPU-Z said BOTH card had a 97% ASIC quality value.
I have NEVER been able to get the flashing ROM to work on my win 7, countless flashes and reflashes and redoing drivers etc etc. Lots of crashes and resetting wattman and recovering drivers etc.
Low and behold, my ASIC quality on both cards is now 76%... So not saying this had anything to do with it.... but 97% ASIC brand new to 76% today with dicking with all this shit.
According to everything I've read, ASIC quality cannot change. GPU-Z does not calculate it, it reads it. The ASIC quality is assigned at the factory. Don't take my word for it, I don't know shit:
https://www.techpowerup.com/forums/threads/what-is-asic-quality-and-how-does-it-affect-overclocking.215107/