Crucial CT4G4DFS8266 4GB DDR4-2666 UDIMMMake everything on your computer fasterMemory is a component in your computer that allows for short-term data access. Since your system’s moment-to-moment operations rely on short-term data access – loading applications, browsing the Web or editing a spreadsheet – the speed and amount of memory in your system plays a critical role. Load apps in seconds by increasing the speed of your memory and installing more of it.Micron® quality – a higher level of reliability.As a brand of Micron, one of the largest memory manufacturers in the world, Crucial Desktop Memory is the standard for reliable performance. From the original SDRAM technology all the way to DDR4, we’ve engineered the memory technologies that have powered the world’s computers for 40 years and counting. When you choose Crucial memory, you’re choosing memory that’s backed by a limited lifetime warranty and designed for the world’s leading systems.1 Don’t settle for anything less.