USB port speed vs. root hub speed

[Jgor]

I have a Dell Inspiron 1545 with 3 USB 2.0 ports. However, Device Manager shows 8 USB root hubs, 4 of which are full-speed (1.0) and 4 are high-speed (actual 2.0). How can I determine which ports actually run at 2.0 high speed?

 

[Dereck47]

USB 1.0 (Full-Speed) bandwidth speeds are up to 12Mbit/s. 12Mb/s equals 1.5MB/s.
USB 2.0 (High-Speed) bandwidth speeds are up to 280Mbit/s. 280Mb/s equals 35MB/s.

Connect a thumb drive or an external HDD to a USB port and test Read/Write speeds with ATTO benchmark software.
If your Read/Write speeds are greater than 1.5MB/s then you know it's a USB 2.0 port.

Repeat the test on all USB ports.