Keep in mind, later brisbane cores do NOT like vcore. Anything over 1.45 produces serious heat, and barely any more OCability due to the extra heat. Smartest move is to keep the voltage below 1.45 and see what it can achieve.

My 4800+ brissy does 3.1 on around 1.4v IIRC, which is pretty decent. I should test it out properly.