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.
Are you sure that's the exact power draw of a rx6800xt or you are telling us what your mining software is displaying? Get yourself a wattmeter and see the actual wattage that rx6800xt is pulling from wall because I can bet with you that it's more than 172watt
That 172w is what Phoenixminer was saying, I know thats not the same as at the wall. Just tried bios mod finally got it to 625mv (didnt bother going lower).
So now it is 64.6mh/s and 137w in miner. I also tried changing ram speed but it wouldnt even do 2mhz more without crashing.
Pretty happy with the about 20% less power usage thou. Runs 5c cooler, should of done this much sooner.