The Sony a9, or my memory card, seems to have had a bug that caused it to perform at UHS-I speeds. I definitely had it in the correct slot (we show it in the video) and I checked it with a Sony rep. I'm sure the bug will be fixed by the time the camera ships to customers.
That's basically all I say in this video; you don't need to watch it. I just thought this was important enough to publish an (unmonetized) update.
Order the a9 on Amazon at http://help.tc/a9. Check out Max's channel
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