The PCIe x1 RTL8111H Six 1G RJ45 network card is a high-density, multi-port Gigabit Ethernet adapter designed for advanced networking applications such as firewalls, routers, and virtualization servers. Featuring six independent Realtek RTL8111H controllers, it delivers six 1 Gigabit RJ45 ports through a single PCIe x1 interface, making it ideal for compact systems requiring multiple network interfaces without sacrificing expansion slots.