Gigabit Ethernet card makes you enjoy super fast Ethernet connection! Stable and reliable chip  RTL8111E Compliant with Single-Lane (x1) PCI-Express specification revision 1.0a Supports 2.5Gbp/s throughput PCI-E with full duplex channel. Support 1000BASE-T 100BASE-TX and 10BASE-T. Compatible with IEEE 802.3802.3ab802.3u 802.3x 802.1Q VLAN Support Full Duplex Flow Control (IEEE 802.3x) Compatible PCI 2.1/2.2 PCI Express x1 interface compatible with PCI Express x1 x4 x8 x16 slots Automatic speed negotiation and smart speed shift down. One external RJ-45 female connector available Supports plug and play Bus-powered mode and no external power required. Automatic Crossover Detection and Correction Supported Support full duplex mode that doubles the network connection Connect more devices easily & quickly to your computer! OS support: Windows 2000 2003 XP(64-bit) Vista(64-bit) Win 7Win 7( 64 bit)