The Synology DDR4 2666 MHz RDIMM Memory Module (D4RD-2666-16G) is a high-quality memory module designed for computers and networking devices. With a total capacity of 16GB divided into 1 module, this DDR4 SDRAM module offers fast bus speed of PC4-21300 (2666 MHz). It comes with a lifetime manufacturer warranty and features memory enhancements for improved performance. Ideal for boosting the speed and efficiency of your computer or networking device, this memory module is a reliable choice for upgrading your system.