If you search 'weird USB port', it brings up this thread. Much debate was had over my Acer 5750Z-4835's mystery port.
I eventually RTFM'd my paper manual, and in the diagram for this side of the laptop, it says, "USB 2.0 / 3.0* port", but reading it carefully seems to indicate it would be blue if we had the proper model with USB 3.0.
Sorry for necro'ing the thread, but I was positively influenced by
XKCD.