The Crucial 16GB DDR4-2666 PC4-21300 UDIMM Memory RAM CT16G4DFD8266 is a high-quality RAM module designed for computer systems. With a total capacity of 16GB split into one module, this DDR4 SDRAM memory provides fast and reliable performance. Compatible with a 288-pin UDIMM form factor, this memory has a bus speed of PC4-21300 (DDR4-2666) for efficient data processing. Ideal for upgrading or replacing existing memory modules, this Crucial RAM is a dependable choice for enhancing your computer's performance.