Changing the Speed and Duplex Mode of Network Card in Microsoft Windows

Sometimes you might want to check or change the speed and duplex mode of network card in order to troubleshoot home network access problem, such as slow Internet connection or no connectivity problem.

Here is simple instruction on how to do it in Microsoft Windows:

1) Open Windows Explorer, right click My computer and click on Properties.

2) System Properties window will appear, click on Hardware tab and then click Device Manager.

Note: Of course you can always use different methods to open this Device Manager.

Device Manager in Microsoft Windows (Windows XP, Vista, 7, etc)

3) Expand Network adapters’ entry in Device Manager window, right click the network card that you want to change speed/duplex setting and click Properties.

speed and duplex change in Microsoft Windows to solve slow Internet

4) Go to Advanced tab of network card’s properties window, here you can locate the entry to check or change the speed/duplex setting, normally it can be Speed & Duplex, Link Speed & Duplex, Link Speed/Duplex Mode, etc. You can proceed to change the setting to Auto or other specific speed/duplex mode (10Mbps full duplex, 100Mbps half duplex, 1000Mbps half duplex, etc). Finally click OK and close all windows.

Note: Most of the time the network card should work well by having auto, auto mode or auto negotiation setting, but sometimes it can cause slow network or Internet access problem. If you know the speed/duplex mode of connected router/switches, you can set to specific speed/duplex setting and test it. If not sure, test on all different settings.

change speed and duplex mode in Microsoft Windows, can be full duplex or half duplex

Related Articles:

Using Ping to Troubleshoot Network Problem

How to solve limited or no connectivity problem

Cannot Connect to Wireless Network? Check here!

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