You asked what mbps I have, it's Spectrum 400 mbps, that's why I have Qualcomm Atheros AR956x 400 mbps modem.
If I disabled the Realtek PCIe FE Family Controller 10/100, would the USB 3.0-to-Gigabit Ethernet Adapter give me speeds close to 400 mbps? Or would I not be able to connect to the modem?