HP Xeon MP 191220-B21 1.50 GHz Processor Upgrade - Socket PGA-603 - Single-core (1 Core) - 1 MB Cache - 400 MHz Bus Speed - 1 Pack. The Intel Xeon processor MP provides outstanding performance and headroom for demanding enterprise server workloads. This processor features the Intel NetBurst microarchitecture, Hyper-Threading technology and an integrated three-level cache architecture to mid-range and high-end server platforms that support four or more processors in multiprocessor configurations. The Intel NetBurst microarchitecture offers a 400 MHz system bus for outstanding throughput and scalability for multiprocessor platforms and multi-threaded server applications. Hyper-Threading technology improves processor efficiency by supporting multiple software threads on each processor in the system, thereby improving performance on threaded server applications. Intel Xeon processor MP-based platforms are ideal for large e-Business and enterprise server workloads that are compute- or transaction-intensive, and demand the stability and versatility of the Intel architecture.