I was getting 520-530 @110watts and I'm unsure on settings due to it not being very stable, haven't tried with more power though. This was on the EVGA models.

Been busy trying to get SMOS working properly before pushing more. Currently at 500 avg on each of my 3 cards. So not sure if its worth squeezing any little bit more out. 

Have you had SMOS site say a rig was offline but the rig still be mining to pool fine? Mining ZEN on Suprnova.