Cisco X520 Server Adapter - PCI Express x8 - 2 Port(s) - Optical Fiber - 10GBase-X - Plug-in Card 10Gigabit Ethernet Card guarantees a faster and efficient networking interface to client, server or workstation with maximum connectivity reliability This 4000 MB/s bandwidth PCI Express x8 adapter ensures easy connectivity and plug-in form-factor for affordable and reliable Ethernet network This dual port 10gigabit ethernet card lets you add two network ports using a single expansion slot to a client, server or workstation Supports optical fiber cable to span longer distances and provides data transmission rates par excellence between servers and network components With the 10GBase-X technology get up to 10Gbps data transfer rate over the supported network cable