The HP 817749-B21 is the part number designated for purchasing the HP 640FLR-SFP28 10/25GB 2-Port FlexLOM Adapter as a standalone product. This networking adapter is engineered to provide high-speed and high-density connections for HP servers, particularly beneficial in environments where bandwidth-intensive applications are run. The adapter leverages SFP28 technology, accommodating both 10GbE and 25GbE speeds that support a wide array of network infrastructures. Equipped with two ports, it doubles the network capacity without occupying extra space, utilizing the FlexibleLOM slot for easy integration. This design facilitates scalability and flexibility in network planning and upgrades, making it a cost-effective solution for growing business demands. The HP 640FLR-SFP28 also focuses on virtualization performance, supporting advanced features for network partitioning and offloading, thereby enhancing overall system efficiency.