I can't change Dram Voltage in my mortherboard

hoang bo

Prominent
Mar 13, 2017
5
0
510
my mobo is P7P55D Pro it does allow to change Vram Voltage but it's allway show currrent volt about 1.1-1.2 and it't to low cause BDOS when my PC in heavy load,what wrong with it,i'm already put new RAM,PSU update lastest BIOS 2101 and still no luck.
Full spec:
ASUS P7P55D Pro
i7 870 non OC
2x4GB Gskill 1600 AGIS
here a pic
2017f8a95886-0193-469f-9cee-67cac3a08f6b.jpg