I have recently upgraded my Internet connection with my ISP (Movistar, Spain) and now I have a 600 Mbps one.
My Windows 10 computer (has a Gigabyte GA-Z87P-D3 motherboard) is capable of running a connection of 1Gbps, but it gets stuck at 100Mbps.
First of all, I've done some research and I configured the network card's speed to 1Gbps Full Duplex and upgraded the drivers to the latest version (a release from two days ago). This did not solve anything.
The second method I've tried was to change the Ethernet wire (CAT 5e, both of them) and to connect my laptop to the same both wires. The result was a 1Gbps connection on my laptop (with both wires) and still the 100Mbps connection on my PC.
I'm thinking on buying a new network card, but I prefer to explore other solutions before doing so.
I hope you can help me!
EDIT: I've tried downgrading the drivers and updating BIOS. Still the same.
I guess is not a router limitation, I can get the 600Mbps connection with my laptop with the same wire and plugged in the same "router spot" as my PC.