Part number 381587-B21 is a HP‑branded AMD Opteron 850 processor designed for use in HP ProLiant BL20p servers. The CPU operates at a clock speed of 2.4 GHz and utilizes a 1000 MHz front‑side bus to communicate with system memory. It is built for Socket 940 platforms and incorporates a 1 MB L2 cache to improve data access efficiency. This processor provides the performance and compatibility required for enterprise‑level workloads on the BL20p chassis, offering a reliable solution for organizations seeking to maintain or upgrade their existing HP server infrastructure.