The apple info page states that the data rate for AIC is about 7mb/sec for 720p30.
There are a few posts in this forum which denote testing that has been done with different codecs and different sizes. The tests were done using Catalyst so under the circumstances it is a better choice to use the Catalyst reports instead of the Apple reports.
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TODD SCRUTCHFIELD
...if it ain't broke...
gimme 5 and then don't act surprised