The product 720479-B21 is a server memory module that offers high performance and reliability. It has a capacity of 16GB and operates at a speed of 2133MHz. The memory module is designed for HP ProLiant Gen9 servers and provides improved data transfer rates and faster system responsiveness. It also supports error checking and correcting (ECC) technology, ensuring data integrity and reducing the risk of system crashes. The 720479-B21 is an ideal choice for businesses that require efficient and dependable server performance.