i dont think i have ever seen my card reach the power limit of 110% most ive noticed is 106%. so if i unlocked the voltage would that mean i can overclock further without driver crashes? my best OC is less than +80 on the core. this never changed when i changed the stock cooler for a prolimatech mk26. cooler temps but my OC was not getting better.
i am just waiting on my gpu block to be repaired then i will be going underwater.
It might help you get a higher boost. Or you might just be one of the unlucky ones and got a card that won't OC very well (silicon lottery and all that!). Plus the boost a card will reach obviously depends on what you are running.