The 409391-B21 is a Hewlett‑Packard part designed specifically for the ProLiant DL585 G2 server platform. It houses an AMD Opteron 8216 dual‑core processor that operates at a clock frequency of 2.40 GHz and includes a 2 MB L2 cache. The CPU utilizes the Socket F interface, ensuring proper mechanical and electrical compatibility with the server’s motherboard. This processor delivers the performance characteristics expected from a dual‑core Opteron model, making it suitable for workloads that benefit from the balance of core count and cache size. The component is supplied as a genuine HP replacement part.