Many reviewers on internet received v1.0 version of same card (GV-R797OC-3GD) which was voltage unlocked and most of them easily overclocked to 1200MHz+.
Mine is rev 2.1 (bios F70), and it is voltage locked and I can bearly achieve stable 1060MHz. GPU temperature is around 60ish degree C, so more then OK. I have tried every overclocking tool and none of then could adjust the voltage. Flashing old BIOS version is not possible.
I am very disapointed and obviosly mislead when buying this high-end product od $449, advertised a "OC" version.
Gigabyte, please release a voltage unlocked BIOS, well at least up to 1.25V which should be quite safe.