I have a zotac 2070 amp extreme core, and it's pretty locked down, even the fan settings for some reason. I believe people think most 2070's have pretty strict power limit's in the BIOS and/or hardware itself.
I gave up trying to OC this thing manually, it just overrides, MSIAB. And in zotac's own software, which I should use, but MSIAB have the rivaFPS counter in games, so.....zotac's OC program also get's over-ride'ed by the BIOS limits.
I never tried changing the voltage tho, but again, does it even matter, if it just over-rides it anyways, as soon as the BIOS says, too much power and/or temp.
IDK, in the past, how easy was it to cook a GPU to death.
Have people had much luck swapping BIOS on these, what have the hackers been up too ? I'm too afraid of bricking mine to try anything. I'm too poor.