This is the built in ethernet connection on my MSI Z170A Gaming Carbon Pro motherboard.
I just built this PC and installed Windows 10 on it.
I've checked everything as far as the actual wired connection, the modem itself, and all of that checks out. The same ethernet cord that runs to this PC, I tested with a laptop. The laptop gets proper up/down speeds.
Realistically, my down and up speeds should be 130-160mbps and 25-30mbps.
I am getting about 125mbps down, 2-4mbps up.
The drivers are up to date. I do not know if this is an issue with windows 10, or the built in Intel Ethernet itself. If anyone has any input, it would be greatly appreciated. These upload speeds are killing me!