Syba SD-PEX24033 Dual LAN Ports 1000-Base T Gigabit Ethernet Card Green Realtek RTL8111E chipset Backward compatible to 10/100baset-t networking Complies with PCI-Express Revision 1.1 10/100/1000Mbps data rate auto negotiation operation Fully compliant with IEEE 802.3, 802.3U, 802.3ab Realtek RTL8111 Chipset Complies with PIC-e Revision 1.1 1-lane (x1) PCI-e with Transfer Rate 2.5Gb/s Full Duplex Channel A high Performance 1000Base-T Ethernet Controller Card Backward Compatible to 10/100Base-T Networking 10/100/1000Mbps Data Rate Auto Negotiation Operation Compatible to Existing CAT-5 UTP Cabling Fully Compliant with IEEE 802.3, 802.3u, 802.3ab