I got Sapphire Nitro 6800xt SE, Getting 64.3-64.7mhs, no bios mod but runs 172w.
Core 1500, Mem 2150, custom fan curve. Temps range from 48-52c, junction 58-60c.

I want to do the bios mod but I do game a few hours most days not sure if I can do that with lower voltage?
The other thing is if my card isnt running 170w+ then my hash goes to crap ie 29mh/s at 160w.
Basically atm I have to keep core around 1500 or it goes lower voltage and kills my hash.