Can't do it on the 79's unless RBE has been updated, or someone else makes an app, made my own custom bios with RBE on my AC Extreme CrossFire 6950>70's@silly volts.
Would just make profiles in an unlocked CCC varying in clockspeed all the way up to 1050MHz.
MSI AB in the background then, I guess...
But will do a bit more of research!