M.2 A Key and E Key to 1 Port 2.5G 100Mbps Gigabit Ethernet NIC Network Card | eBay
Amazon.com: 2.5GBase-T PCIe Network Adapter with 1 Port, 2500/1000/100Mbps PCI Express Gigabit Ethernet Card RJ45 LAN Controller Support Windows Server/Windows/Linux, Standard and Low-Profile Brackets Included : Electronics