My PC has a network card or a Realtek 2.5GbE Network card. For a long time, I am using the network driver provided by Microsoft, which is from Windows 11.

Recently, I think I can try the Realteck official driver, and see how much difference.

Setup testing environment

iperf3 server is a NAS, with a Gigabit connection to the Switch, TP-Link TL-SG3210XHP-M2 Network Switch.

From the Switch to a AP, is a 2.5GbE connection.

iperf3 client is my PC, with a Realtek 2.5GbE card, with a Gigabit connection.



Here is the iperf3 testing result, based on the current driver, dated 2022.01.19.

The bandwidth is 880Mbits/sec.

Update the driver

I checked the official Realtek website and the download page

I download the Win11 Auto Installation Program (NetAdapterCx)  driver file.

Then, install it.

The latest version of the network driver is 1125.7.318.2022, dated 2022.3.18.


I run the test again.

The Bandwidth is 949Mbits/sec

It is about a 7.8% improvement in performance. I did nothing, but upgrade the driver of my PC and with all default settings.




David Yin

David is a blogger, geek, and web developer — founder of If you like his post, you can say thank you here

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