How to Determine Link Speed of a Network Interface Card
Determining the speed of your network card helps you configure the network. When running a home or business network, the network card speed determines how fast the communication will travel between computers. Networks that need to transfer large data require faster speeds than a small, home network. Determining the speed of a network card is accomplished in the Windows system information screen.
Click the Windows "Start" button and select "Programs." Choose "Accessories" from this menu and then select "System Information." This opens a new window with a list of devices and configurations on the machine.
Expand the "Components" section by clicking the "+" symbol. This shows a list of devices installed on the computer.
Click the "+" symbol next to the "Network" section. This lists the network adapters installed on the computer.
Highlight the network card in the list. When highlighting the device, details are shown about the network card. It displays the speed of the card. For example, the following indicates a 100Mb Ethernet network card:PCI 3COM 2B567C 10/100 Ethernet