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There is a slider in MSI Afterburner that I don't remember seeing when I did my overclocks on my last cards a couple of years ago... under "Power control properties", there is a "Power limit" setting, with a slider from -20% to +20%. As of now, it is defaulting to +0%.

There is also a setting for "Graphics processor type" with a drop-down menu. It defaults at 1175 mV, but there are also settings for 1112mV, 1050mV, and 1025mV.

Should either of these be changed? If so, what do they do?

By the way, the cards are dual HD7970 (specifically, MSI R7970-2PMD3GD5) in Crossfire mode.