There is no "Additional Turbo Voltage" option in the UEFI bios as of 1601.
I've read you posts from this board and another, and know what you are looking for. Its not there. The only option are the +/offsets and the Digi + Power modifcations in AI Suite 2.
Asus MVE @1707, IRST 12.5, MEI @ 8.01, w/Intel i7-3770K@4.60 Ghz @ 1.275 with .050 - offset, on Corsair H100, w/(4) Corsair XMS 2000 @ 2000 9-10-9-27-51 @1.65, (2) Crucial C300 128 GBs running in RAID 0 as primary drive, with 3 Terabytes of Data Drives. (1) Powercoler 7870 MYST stock.