If you plug in a USB2.0 device and it runs slowly, the port isn't 2.0. Windows should pop up saying "This Device can perform faster...blah blah blah...if you insert it into a USB2.0 port" or something like that. If that message comes up, it means the port isn't USB2.0. It should still work, just slowly. For your Pentium (P4 maybe?) board, you probably have USB2.0, but if the front ports are on a different controller or through a hub, it could be reduced to 1.1.