The Adapter, XM-NA3840 is a highly integrated and cost-effective Quad Gigabit PCIe Ethernet Adapter which is fully compliant with IEEE 802.3, IEEE 802.3u and IEEE 802.3ab standards. This Quad Gigabit network adapter keep low cost and eliminate usage barriers. It is the easiest way to upgrade a network environment from 10/100Mbps to 1000Mbps. It supports 10/100Mbps network speed automatically both in Half-Duplex and Full-Duplex transfer mode, and 1000Mbps in Full-Duplex transfer mode, by using Auto Negotiation technology to detect the network speed.