This PCIe to 4-port 2.5G Ethernet network adapter can provide 2.5 Gigabit Ethernet network faster than Gigabit network speed, support high-performance -channel network and full-duplex communication to achieve speeds up to 2500 Mbps and fast transfer rate, compatible with existing Ethernet.Driver Download: https://.realtek.com/-/component/zoo/category/network-interface-controllers-10-100-1000m-gigabit-ethernet-pci--softwareSupports 2.5G Lite (1G data rate) mode. Supports PCI 2.1. Supports 4 high performance 2.5-Gigabit LAN ports. Auto-Negotiation with Extended Page capability (XNP). Compatible with NBASE-TTM PHY Specification.Supports pair swap/polarity/skew correction. Crossover Detection & Auto-Correction. Supports hardware ECC (Error Correction Code) functionSupports hardware (Cyclic Redundancy Check) functionTransmit/Receive on-chip buffer supportSupports PCI (Message Signaled Interrupt) and -XSupports down/link down saving/PHY disable modeSupports ECMA-393 ProxZzzy Standard for sleeping hostsSupports LTR (Latency Tolerance Reporting)Supports 32-set 128-byte Wake-Up Frame pattern exact matchingSupports WPI (Wake Packet Indication)Supports PCIe L1 substate L1.1and L1.2Compatible with IEEE 802.3, IEEE 802.3u, IEEE 802.Supports IEEE 1588v1, IEEE 1588v2, IEEE 802.1AS time synchronizationSupports IEEE 802.1Qav credit-based shaper algorithmSupports IEEE 802.1P Layer 2 Priority EncodingSupports IEEE 802.1Q VLAN taggingSupports IEEE 802.1ad Double VLANSupports IEEE 802.3az (Energy Efficient Ethernet)Supports IEEE 802.3bz (2.5GBase-T)Supports Full Duplex flow control (IEEE 802.3x)Supports jumbo frame to 16K byteSupports standard and low profile chassisSystem RequirementWindows OSLinux, for OS and DOSPCI -enabled system with an available PCI slot.Material: PCB+Metalcolour: blackPackage Contents:1 x PCI- to 4 Ports 10 /100/1000M/2.5G Ethernet Card1 x Low-profile bracketOnly 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.