Here are my settings.
My best 6800 cards get 62.5
My worst gets 59.3
But after reboot sometimes its at 61-62.
These are my most stable settings and took lots of tweaking
In case reading this at beginning of your journey -
If I could go back before I bought any 6800s … I would only buy 5700xt instead - get all the bios modded from this guy website (You just telegram him and chat, send him $10, and he logs into your rig and takes care of all your 5700xt and 5600xt bios and settings). His modded 5700xt get around 55mh. which is 7 less than the best i can get my 6800s and use 30 wats less power and can get much cheaper)
Good luck guys/gals