Microsoft and Realtek often bundled these drivers together in a single package named something like rt640x64.inf or netrt64.inf . This is why Windows 10 might try to install an RTL8139 driver for your 810x PCI-E Gigabit card—or vice versa—leading to blue screens, limited connectivity, or "Ethernet doesn't have a valid IP configuration."
: Increasing these values can help handle higher network traffic more smoothly. Flow Control realtek rtl8139 driver 810x family pci-e gigabit windows 10
One important limitation: neither the RTL8139 nor the 810x family supports fully in older hardware revisions. Windows 10’s heavy reliance on IPv6 (for Cortana, Store, and updates) can increase CPU usage slightly—by 2–5%, barely noticeable on modern CPUs. Microsoft and Realtek often bundled these drivers together