What are these 3 cables that came with my case?

Solution
The big one has 20 holes for pins, I have a spot with only 19 pins and it fits in ....is USB 3.0 AND IT'S SUPPOSE TO BE 19 your all set with that.

HD Audio plugs into board too , manual shows all these connections.

Muath_

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Oct 18, 2015
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I checked my manual, how about the 3rd cable?