The HP 539821-B21 is a processor kit featuring the AMD Opteron 8425 HE six‑core CPU. It operates at a base frequency of 2.1 GHz and supports a 2400 MHz HTL interface. The processor includes a 6 MB L3 cache and is designed for the Fr6 (1207) socket, ensuring compatibility with a range of server and workstation platforms. This kit delivers robust multi‑threaded performance for enterprise workloads while maintaining power efficiency. Ideal for data‑center and high‑performance computing environments, it offers a reliable, scalable solution for demanding applications. The kit is suitable for deployment in both new builds and upgrades, providing a cost‑effective way to enhance processing capacity.