Adds multi-gigabit Ethernet capability to your server or desktop computer, quickly enable 2.5G, 1G, 100Mbps, or 10Mbps connection over dual RJ45 ports Easily add two multi-Gigabit Ethernet ports through an available x4 PCIe slot to server and desktop computers Compliant with PCI Express Specification Revision 2.1 Compatible with NBASE-TTM Alliance PHY Specification Supports 4 Multi-Speed of 10M/100M/1Gbps/2.5Gbps Ethernet data rates Compatible with IEEE 802.3, 802.3u, 802.3a, IEEE 802.3bz (2.5GBase-T), IEEE 802.1Q VLAN tagging, IEEE 802.3az (Energy Efficient Ethernet) Supports jumbo frame to 16K bytes for higher and better data throughput Supports Full Duplex flow control IEEE 802.3x Supports Wake-On-LAN and ''RealWoW!'' Technology (Remote wake-up) Fits both standard and low profile system chassis with the included spare low profile bracket