My internet speed wont run at 1.0 Gbps on my Realtek PCIe Family Controller [duplicate]

I have solved the issue by upgrading the driver. The Realtek driver downloads can be found here.

There are several different Realtek chips which identify themselves as Realtek PCIe Family Controller. Although many of these chips support 1 Gigabit ethernet speeds, some do not, and there are new laptops sold, even now in 2017, with only a 100MB/s Realtek chip. Unfortunately, the HP Envy machine I got at Costco is one of them.

To check if your hardware supports 1 GB/s, go to the properties page for the ethernet adapter and configure the driver. On the advanced tab, select speed & duplex (you might have to scroll down in the list). Check the dropdown on the right to see if 1000 Mbps is listed.

If the chipset in the laptop does not support Gigabit ethernet, but has a USB 3.0 port, then a workaround is to use a (e.g.) USB 3.0 to 10/100/1000 Gigabit Ethernet Adapter.