Man of Honour
Well my card is not what I'd class as an overclockers dream, locked memory, no voltage control, maybe only in my dreams.
Early days though yet, +100mv could make a vast improvement, but the card is so new so the current software available can only alter core clock.
I think in the next few months we should be good for at least 10% improvent from the drivers alone. With the Fury X Fiji cards AMD are starting from scratch which is totally different to what NVidia had with the GM200 cards.
With the Titan X and 980 ti they already had a head start with drivers as the 970 and 980 share the same Maxwell architecture.