The only program that I know of that allows its user to infinitely (not really but apparently enough) increase the voltage delivered to a graphics card is the MSI Afterburner Extreme. However, as far as I know, this program can only be aquired if the person who wants to do so contacts his or her local MSI rep. This method is officially promoted by MSI, but it has not worked for a lot of people yet, as far as I know at least. MSI usually only gives the MSI Afterburner Extreme to people who overclock graphics cards professionally. I know that this advice that I gave you is not very helpful. I myself use four MSI Radeon HD 7970s (these graphics cards are almost identical to the graphics card that you mentioned, they only have a BIOS in which they are slightly overclocked). I watercool them with an Aquaduct 720 XT (which is a radiator that cools passively, and actively with six 140mm fans). I myself would like to deliver a higher voltage to my graphics cards as I can do with the MSI Afterburner since I am quite sure that I could overclock them more since they are cooled well enough, but unfortunately MSI would probably not give the MSI Afterburner Extreme to me if I asked them for it.