IBM 90H9661 four-way processor board supports quad-socket configurations for enterprise server architectures, commonly found in high-density computing environments requiring parallel processing capability. Designed for legacy IBM POWER and System x platforms, this board provides the mechanical and electrical interface for multiple processors, optimizing throughput in workloads including virtualization, database operations, and scientific computing. Compatible with corresponding IBM server chassis and backplane configurations; part number 90H9661 enables scaling of CPU resources within modular server designs. Typical applications include data center consolidation, mission-critical application hosting, and compute-intensive batch processing. This refurbished unit has been tested and guaranteed; available via quote from G5 Network Group.