PCIe X4 RTL8125B 2.5G Ethernet Multi-Gigabit Server NIC combines a quad-speed IEEE802.3-compliant media access controller with a quad-speed Ethernet transceiver Compliant with 10/100Mbps Ethernet IEEE802.3u specification and IEEE802. 1000Mbps Ethernet specification and IEEE802.3bz 2500Mbps Ethernet specification It also provides high-speed transmission via CAT5e UTP cable or CAT3 UTP (10Mbps only) cable It is suitable for multiple market segments and emerging applications such as desktops, workstations, servers, communication platforms and embedded applications Compatible with Linux, Win 7/Win 8/Server 2008/Win 8.1/Server 2012/ Win 10 32/64bit Main chipset: Realtek RTL8125B Bus type: PCIe x4 2.5Gbps/5.0Gbps, revision v2.1 Transmission medium: 6 x 2.5G RJ45 ports Transmission rate: 2.5G/1000/100Mbps Network mode: Support 2.5G and 1G Lite mode Network topology: Support IEEE1588v1, IEEE1588v2, IEEE80.2AS time synchronization Colour:As Shown Material:PCB+Components Package Contents: 1 x Network Card 1 x Bracket 1 x CD driver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.