The Crucial 8GB DDR4-2666 UDIMM CT8G4DFS8266.C8FE is a single module of memory designed for computer systems. It has a total capacity of 8GB, with each module providing 8GB of memory. The memory features are registered and the form factor is UDIMM, making it suitable for desktop computers. This DDR4 SDRAM module operates at a bus speed of PC4-21300 (DDR4-2666), with 288 pins for connectivity. The product does not come with a manufacturer warranty, but is backed by the Crucial brand reputation. Made in Mexico, this memory module is a reliable choice for upgrading or replacing existing memory modules in computer systems.