Well EVGA PrecisionX 16 is out for overclocking graphics cards and i wanted to let you all know that it allows my GTX 770 Classified to hit 1.3 volts......Before you could barely get over 1.2 volts unless you used the Classified voltage tool.
It does everything MSI's Afterburner does but i prefer it. I have not tried the latest Afterburner so I do not know if it will allow for 1.3 volts on the GPU core.
SO just giving you all a heads up I think it will allow you to push your 770's and possibly 780's and 760's even more as long as you keep your temps in check, But EVGA PrecisionX 16 will lower your clocks if temps reach your set max temps anyway so no worries. Enjoy tweaking fellas.