Overclocking voltage locked GPU

I have a XFX HD7770 and I have increased the speeds a little bit to 1075/1250 as any further results in instability due to not enough voltage. I am unable to increase my voltage as it is locked on my card however would increasing the power setting in CCC provide any benefits, because what does the setting actually do? In my understanding P=IV (Power, Current and Voltage), and if P is being increased, then surely I and/or V is also being increased which must mean that the voltage is being increased no?

Anyone shed some light on this please?

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More about overclocking voltage locked gpu
  1. No, I don't think that's how it works, but someone else can confirm or deny that. You can also flash the GPU bios to one that allows voltage control, which will void your warranty.
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