Okay, we had the scene at the end of ONI: Sword Base, but that was likely a low-power shot.
If I recall correctly, a super MAC has a yield in the gigatons, though it may have been retconned. That's more than a hundred times the energy of the Tsar Bomba, which was already unimaginably powerful. I'm guessing it could potentially be more effective at glassing a planet than the covenant energy projectors, and possibly even causing earthquakes and tectonic disturbances(I am not a geologist).
[Edited on 07.28.2012 5:52 AM PDT]
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[quote][b]Posted by:[/b] Quantam [quote][b]Posted by:[/b] Cmdr DaeFaron And, If I may point out, we don't know the round at end of Sword Base is a Super MAC round. It could be a frigate firing.[/quote] More likely, it could be an intentionally weaker shot. [/quote] Perhaps. But people tend to view "Orbital defenses" as meaning ONLY super MAC stations. Where Orbital defenses could mean many things.