USB 3 the protocol isn't backwards compatible with USB 2, USB 3 ports just include both USB 2 and USB 3 pins (what one might call dual stack). You can easily co

USB 3 the protocol isn't backwards compatible with USB 2, USB 3 ports just include both USB 2 and USB 3 pins (what one might call dual stack). You can easily connect two differnt devices one to the USB 2 pins and one to the USB 3 pins. If you only want to connect USB 3 devices, there is no need for USB 2 Pins, as done on the PS4. There is also no specified way to convert USB 3 to USB 2, but some have tried, with mixed results.