With RBE i did edit my radeon bios, new setting is 700 / 1000 @ 1.158v ( with this voltage i know it is stable at 720mhz)

my question is :

Can i set other voltage over 1.158v from bios? Hd4850 GS is 1.200v , i will want set 1.200v from bios but is it possible?