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?