And how is that any different to what you can select with nibitor? I don't see any voltages higher than what it already offers you with a nice GUI. Note that voltage tables vary with different GFX vendors and bios revisions, I have seen GTX 260 cards with 1,13, 1,15V and 1,18V 3D voltage so far. Also min. 2D values usually vary from 1,03V to 1,06V.

Apart from the fact that you don't have to flash bios to apply, which is good, it's like 10x more complicated and time-consuming. So I'd just use nibitor