HP part number 508864-B21 identifies the AMD Opteron 8381 HE 4‑Core Processor, a server‑grade CPU designed for high‑performance computing environments. The processor operates at a base frequency of 2.50 GHz and features a 6 MB L3 cache to support rapid data access across its four cores. It is built for the FR5 (1207) socket, ensuring compatibility with a range of HP server platforms that support this socket type. The Opteron 8381 HE delivers robust processing power while maintaining efficient thermal performance, making it a reliable choice for enterprise workloads requiring consistent, multi‑core performance.