Realtek Rtl8139 Driver 810x Family Pci-e Gigabit Windows 10 Updated Jun 2026

The Ultimate Guide to Realtek RTL8139/810x Family Drivers on Windows 10

This is a legacy hardware family. The RTL8139 is an incredibly famous Fast Ethernet chip, meaning its maximum speed is 100 Mbps . It uses the older PCI interface, not the modern PCI-Express (PCI-E) interface.

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: Modern drivers for this chip on Driver Scape or Drvhub often include basic hardware offloading to keep CPU usage low even on older systems. realtek rtl8139 driver 810x family pci-e gigabit windows 10

Go to the Advanced tab in the device properties. Find Speed & Duplex . Change it from Auto Negotiation to 1.0 Gbps Full Duplex . If the connection breaks entirely after doing this, your ethernet cable (must be Cat5e or Cat6) or the connected router port does not support gigabit speeds. Conclusion and Recommendations

Legacy Realtek cards sometimes drop connection when downloading large files on modern operating systems.

Open Device Manager , right-click your Realtek card, and go to Properties . Navigate to the Power Management tab and uncheck the box that says "Allow the computer to turn off this device to save power" . Then, switch to the Advanced tab and disable Green Ethernet or Energy Efficient Ethernet if those options are present. Issue 3: Speed Capped at 100 Mbps on a Gigabit Port The Ultimate Guide to Realtek RTL8139/810x Family Drivers

To install the correct driver without risking system instability, you must identify your card's Hardware ID. Right-click the and select Device Manager . Expand the Network adapters section.

Installation steps:

If you successfully install the driver but face dropouts or capped internet speeds, adjust these settings: Disable Green Ethernet and Power Saving user wants a long article for the keyword

Navigate to > Network Interface Controllers > 10/100/1000M Gigabit Ethernet > PCI Express . Locate the Windows 10 Auto Installation Program .

Look for your Realtek controller. Note the exact model name.

Change the value from Auto Negotiation to .

This is the most common error when running an RTL8139 card on Windows 10. It means the driver loaded, but the OS cannot communicate with the hardware structure.