It is because now you're running at TRUE OC speed. Therefore, you'll need to up the voltage accordingly to keep the higher OC stable. Anyone who get to test this modded BIOS need to keep that in mind.
Before the modded BIOS With throttling, my previous 4.40Ghz @1.40v (210 x21 in BIOS) = 4.20Ghz (210 x20) in reality after being throttle down. Now with the modded BIOS, what I OC'ed is what I get, therefore, the extra 200mhz that I gain needed 1.47v to be prime/linx stable, which is to be expected. As uncleweb stated in the warning document in the BIOS package, use this modded BIOS at your own risk, people need to keep an eye on the underload temperature and don't blame anyone if one get too excited and end up frying the board or the cpu. :D
I tested the EVGA x58 and returned it 3 days later, maybe I had a defective unit but it really sucked! I'm just glad I stick around with the Asus, now with this modded BIOS a good board has transform into a great board as uncleweb stated! :up: :up: :up: