@mrgoldy Hmm... strange, maybe there are some internal USB 2 connectors for legacy compatibility or something like that, that you can only access by opening it up. Or maybe they are connected to some other bus through a different type of connection on your laptop. I really couldn't tell you, but you will notice a big difference in speed from USB 2 to USB 3 when mining. :)
System Builds and other hardware stuff.