How to know which usb port is high speed

Laura9999

Honorable
Apr 26, 2012
2
0
10,510
I have a Dell Optiplex GX 280 built 2007...rebuilt 2011. works great. I need to know which back USB port is high speed and how you can tell. I use a broadband external modem for internet connection. My brother says I need to find the high speed USB. Thanks so much. Laura Lilovich