From a friend I shared the utility with:

Nope, back to lookup table for VGPU voltages, so any invalid selection is automatically ignored. Also I have it on great authority that if you follow NVIDIA reference design (which is the case here in terms of GPU-BIOS access) OVP is at 1.087V

measure on the card and you'll see it doesn't work.
you can set it much like you can with Afterburner but the voltage doesn't actually go up. you could even set it to 1.5V

Hasn't worked for anyone else and when I asked Board Partner they said it can't be done on any reference based card.