The HP 862974-B21 is an 8GB DDR4 memory kit that provides a cost-effective way to improve the performance of HP servers. This kit contains a single 8GB module that operates at a speed of 2400MHz, offering a balance between price and performance for businesses looking to upgrade their server capabilities on a budget. The implementation of DDR4 technology ensures lower energy consumption and higher data transfer speeds compared to older memory technologies. This single-rank, unbuffered module is specifically designed to provide reliable and compatible performance with a wide array of HP servers, making it an excellent choice for expanding the memory capacity of entry-level servers while supporting smooth and efficient operation of applications.