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Thanks AI, Having a 3,1 mac pro, i am always happy with ways to extend its usefulness.

Can you provide simple steps to install beyond stating it needs power from the optical disk power?

I have use the sierra patch to install OS X 10.12 on my 3,1.  Show the card therefore act like your comments for 4,1 and 5,1?

As for why we need USB-C, for old macs, it will be the way that more and more devices come standard, having a card that only costs $16 is a good way to prepare.