Help with MSI afterburner?

Hi

I've recently started using MSI afterbruner mainly to control the fan speed curve of my graphics card but am thinking of overclocking it and was wondering can someone please explain what the power limit (%) setting does>

I believe it can be used to increase the limit of the card's power draw from the PSU. Someone more experienced than me should chime in here just to verify, however.

I have afterburner and I don't even know what setting your talking about. There's no setting in the program that says "power limit (%)." Maybe I'm just using an outdated version though.