Septu

Hey guys. I'm new here and apologise if this is the wrong place for this thread. But i need advice or help. I have recently built a new rig running i7 3770K, corsair dominator GT 2133mhz ram x 16Gb, Asrock z77 OC formula mb, EVGA SC GTX 780. My ram, cpu and gpu are all running WC. So here's my question. I'm having issues OC'ing my gpu it seems i cant get more than 1.149v out of it and i cant get a clock any higher than 1150mhz which seems to me to be very low given the conditions and the card. I have seen other clocking up around 1280mhz but no matter what i dop i cant get stable past this point. I have a sneaking suspicion that the Boost 2.0 is having an impact too. But i really need to be able to achieve more voltage and lose the boost feature. Is there a way i can achieve these things to get a higher OC? Any help would be greatly appreciated cos i'm starting to get quite frustrated lol. Thanks in advance to everyone too.