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My main board has only usb 3.0 ports. If I connect those ports to USB 2.0 ports on pc case will they work as USB 3.0 port (with full speed) or will they work as USB 2.0 ports (with lower bandwith). In other words do 2.0 ports differt from 3.0 ports on computer casing?

marked as duplicate by bwDraco, Community Apr 10 '16 at 19:58

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The ports do differ.

The USB 3.0 port contains extra pins for SuperSpeed communication. Without these pins, devices can only communicate at USB 2.0 speeds.

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