Ok I think I need to clarify what I said earlier.
Your motherboard has USB 3.0 ports in the rear panel
Your motherboard has USB 3.0 onboard ports in order for the front USB 3.0 ports to work
However, your case doesn't not have USB 3.0 port in the front
Therefore you won't be using those USB 3.0 onboard ports
To answer your question directly, if your case has USB 3.0 in the front, that will be the component to utilize the onboard USB 3.0 ports