Go into the ai overclock section in bios and use the arrow key to navigate down to the voltage section, press enter and manually input the required voltage.
Yep dram voltage is the one, ignore what cpuz says as thatll be the spd tables the manufacturers program into the ram, you should be looking at the memory tab in cpuz to ensure your ram timings are set properly.
Not sure of anything that will display the ram voltage, though cpuz will be fine for monitoring the cpu volts.
Lavalys Everest will show you your RAM voltage...