I am assuming that you are using the MSI Afterburner Beta and you have ticked the three boxes in the General tab. I didn't so if you did you are a better man than I 
What card and BIOS version are you running as some cards BIOS will not change voltage and some say that they have say they have but don't?
Don't want you to feel bad, but yes, I ticked those boxes (but because I read about that in some post before, not because I am smart)What card and BIOS version are you running as some cards BIOS will not change voltage and some say that they have say they have but don't?