The Crucial 4GB DDR4 PC4-21300 288-Pin UDIMM RAM module is a reliable and high-performance memory option for computers. With a total capacity of 4GB and a bus speed of PC4-21300 (DDR4-2666), this module offers fast and efficient data transfer. The UDIMM form factor and standard item dimensions make it easy to install and compatible with a wide range of computer systems. Ideal for upgrading or replacing existing RAM modules, the Crucial product ensures stability and performance for your computing needs.