Can't adjust my 7850's Voltage?

My favorite computer store in my country had a sale on the Sapphire HD 7850 1gb Edition, and since I am on a tight budget I jumped at the opportunity because I heard the Sapphire cards, and the 7850 in general overclock like beasts. But I can't adjust the voltage on my card, if I go to Asus GPU Tweak, there is no voltage meter, same with MSI. Why is there no voltage meter? =[
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More about adjust 7850 voltage
  1. In afterburner you have to go into settings and check unlock voltage control.
  2. Already done, still can't adjust voltage.
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