The HP 397415-B21 is a high-performance memory upgrade designed to enhance the overall efficiency and capability of select HP ProLiant servers and workstation models. This kit comprises two modules, each with a 4GB capacity, combining to deliver a total of 8GB of DDR2 memory. Engineered to operate at a speed of 667MHz, this PC2-5300 DDR2 memory ensures rapid data transfer rates and improved system responsiveness, making it an ideal solution for demanding applications and environments. The dual-rank, registered DIMM configuration helps to ensure stability and reliability, making this kit a valuable addition for IT professionals seeking to boost their systems' performance and multitasking capabilities.