The 647899-B21 is a high-performance DDR3 1600 module manufactured by HP, specifically designed to meet the needs of demanding computing environments. With a capacity of 8GB, it is built using a 1Gx72 ECC Reg/RDIMM configuration with a single-rank x4 organization. This module operates at a speed of 1600MHz, providing quick and efficient data transfer rates that are essential for applications requiring high bandwidth and reliability. The ECC (Error-Correcting Code) feature ensures that data integrity is maintained by detecting and correcting errors, making it an ideal choice for servers and workstations where data accuracy is critical. Additionally, the registered DIMM (RDIMM) design of this memory module provides stability and reliability by buffering the control signals, thus enhancing the performance of the system. Its 240-pin interface ensures compatibility with a wide range of HP servers, making it a versatile component for upgrading existing systems or building new high-performance computing solutions.