So I noticed on 3 different cards that I tried to add the voltage offset to, that the FF 00 01 07 0C does not show up after doing (in HxD) Edit > Select Block and putting in the beginning offset from the bios.text (atombiosreader file) and the length. Am I correct in the statement that these cards will not take a voltage offset at all or am I missing some more knowledge to force this in?
You need to check what the voltage controller is, and then add in a corresponding voltage offset then change the table offsets and whatnot to make sure the bios is still valid