10GBase-T PCIe Network Adapter with backward compatibility of 5/2.5/1G and 100Mbps ; RJ45 port and built-in QoS Hyper-fast 10Gbps Networking - Enjoy up to 10X-faster data-transfer speeds for bandwidth-demanding tasks. Complete Compatibility - XG-C100C is compatible with current network standards, including 10/5/2.5/1Gbps and 100Mbps, for seamless backward compatibility. Compatible with Windows and Linux - Supports Windows 10 and Linux Kernel 4.4 for flexible OS integration. RJ45 Port for Easy Migration - Easily upgrade to 10Gbps networking using standard copper network cables. Prioritize Your Games - Built-in Quality-of-Service (QoS) technology lets you prioritize bandwidth and supported gaming packets for a smooth gaming experience.