The 397409-B21 is a DDR2 memory module from HP, engineered to meet the demands of server environments requiring high reliability and performance. This module is specially designed to work in HP servers, providing a trusted solution for enhancing system capabilities. With a speed of DDR2-667, it aligns with systems supporting the PC2-5300 standard, ensuring compatibility and smooth performance improvements. The specification of DDR2-667 128Mx72 ECC Reg highlights its capacity for error-correcting, using ECC technology to minimize data corruption, which is crucial in server operations, and its registered DIMM design, which contributes to system stability and reliability. Offering a capacity of 1GB, and built with stringent quality controls, it is ideally crafted for users looking to upgrade their server memory for better performance and reliability. The 240-pin design is characteristic of DDR2 memory, ensuring it can be easily integrated into compatible server systems. The 397409-B21 stands out as an essential upgrade for HP server systems, emphasizing enhanced data processing and system reliability.