Dell Intel X520 DualPort 10Gb DA/SFP+ Server Adapter, Low Profile – Kit. The X520 DP 10GB DA/SFP+ Server Adapter from Dell™ is a high performance adapter designed for the high-speed PCI Express Bus Architecture. It offers increased bandwidth, reliability and enhanced functionality. The dedicated input/output (I/O) bandwidth of PCIe ensures priority performance on the port - without bus sharing - for Gigabit Ethernet connectivity. This product has been tested and validated on Dell systems and is supported by Dell Technical Support when used with a Dell system.