The 676331-B21 is a high-quality DDR3 memory module produced by HP, designed specifically for server environments requiring ECC (Error-Correcting Code) and Registered DIMM (RDIMM) to maintain system stability and data integrity. As a module within the DDR3 1600 SODIMM 204 pins category, it provides a high level of compatibility with a wide range of server systems. This module features a speed of 1600 MT/s, facilitating fast and efficient data processing capabilities essential in server operations and demanding computational tasks. Boasting a 512Mx72 configuration, this 4GB ECC Reg/RDIMM module incorporates a 1Rx4 structure, meaning it has one rank with four data retrieval bits, optimizing both speed and reliability in mission-critical environments. The inclusion of ECC and its registered nature makes it an indispensable component for servers, ensuring data accuracy and system reliability.