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yes, especially having less mouse lag

I checked this(with unigine and gpu tweak monitor) and i click on my OC profile and then close gpu tweak and the OC is still working.

and so what does gpu voltage % option do?
Other question: gpu tweak has to be open for the overclock work? Or just apply and close?

Can someone answer this?
if I do not touch the bar voltage in gpu tweak II , the OC that i do is safe right? is it still the stock voltage? ask this because, what about the fast gpu degradation when...