Deliver stable 10 GbE connectivity in server environments that depend on fiber uplinks and predictable adapter behavior. The AddOn 593717-B21-AO uses Intel 82599 silicon and a PCI Express 2.0 x8 host interface to provide the bandwidth needed for virtualization hosts, storage traffic, and high-throughput application servers. Its dual open SFP+ port design gives you the flexibility to match the optics already approved in your environment, helping preserve investment in transceivers and cabling. Support for both single-mode and multi-mode fiber makes it easier to fit the card into mixed deployment standards across data center rows, aggregation layers, or remote server rooms. For teams that image systems at scale, PXE support helps simplify bare-metal provisioning and replacement workflows. The plug-in card form factor is suited to standard server expansion slots, while the lifetime limited warranty adds confidence for long-term standardization. This is the kind of adapter chosen when uptime, compatibility, and port density matter more than a lower-cost card with fewer deployment options.