The HP 713981-B21 Memory Kit provides a cost-effective way to improve the performance and efficiency of HP ProLiant servers and selected workstations. This kit includes a 4GB DDR3 module operating at a frequency of 1600MHz, in adherence to the PC3L-12800 standard. As a low-voltage module, it reduces power consumption, making it an eco-friendly upgrade. The single-rank configuration of this memory means it has fewer banks; while this may affect maximum performance marginally, it provides a cost-efficient way to enhance system capacity. This memory also incorporates ECC (Error Correcting Code) technology, ensuring that data errors are detected and corrected in real-time, which is critical in maintaining data integrity and system reliability. Suited for models that do not necessitate registered memory, this Unbuffered (U) memory kit is ideal for entry-level servers and workstations that require a balance between cost and performance improvements.