thanks for this, I just got this card and working on getting it past 700 still, have you also tried the sapphire trixx? This allows for adjustments as well and core voltage out of the box, for some reason even though I adjusted the msi afterbuner config I was still unable to adjust the voltage.

this is my current command line

-v 2 -w 256 -k diakgcn -I 9 --temp-target 75 --auto-fan

core at 1155 , memory at 1040.. haven't played with volt adjustments yet.

Have you tweaked your settings lately?  Also what driver or sdk are you running..