Lenovo introduces the X520 series dual port 10Gb server Ethernet adapters by Intel to provide you with the best connectivity scalability and performance via the PCIe slot. To ensure maximum flexibility, Lenovo offers the short range (SR) 850 nm optic module to support the ability to any combination of the SFP+ optical modules, direct attach copper cables on the X520 Adapters . This enables customers to create the configuration that best meets the needs of their data center environment.