XCSOURCE RTL8111E 10/100/1000Mbps PCI-E Gigabit Ethernet LAN Network Card Adapter for Desktop AC331 Single-lane (x1) PCI-Express with transfer rate 2.5Gbps. RTL 8111E Chipset. 10/100/1000Mbps Networking with Auto-Negotiation. Supports IEEE 802.3, 802.3ab, 802.3u, 802.3x, 802.1, VLAN. Supports Windows XP/ 2000/ 2008/ Vista/ 7/ 8/ Linux.