I just built this computer yesterday and have updated all BIOS and Drivers along the Motherboard I am connecting to a linksys wrt 1900AC with a Cat6 cable that was used on my older computer(connecting at 1Gbps) I cannot think of anything else and I do not have any other NIC cards to install in a PCI slot to find out if it's just the onboard nic. I have set the card to auto-negotiation and 100.00 Mbps full duplex is all I get I tried to force the 1Gbps connection and windows tells me that I have a cable unplugged until I change it back. Jumbo Packets are disabled. I have been trying to find anyone with the same problem online and I have seen a couple of posts not related to this specific card.
Thanks in advance for any help that you provide.
Can you check if can force the gigabit port speed on the Linksys WRT 1900AC router to 1 Gbps? I checked on the tech spec, this router has 4x Gigabit LAN port. Just to double check if you have test each port to isolate the issue?