The Samsung 4GB DDR4-2666 PC4-2666V SO-DIMM M471A5244CB0-CTD is a set of memory modules designed for computers and laptops. With a total capacity of 4GB spread across 5 modules, each with a capacity of 4GB, this non-ECC unbuffered memory is perfect for boosting your system's performance. Made by Samsung, a trusted brand in the industry, and backed by a lifetime manufacturer warranty, these DDR4 SDRAM modules are reliable and high-quality. With a bus speed of PC4-2666V, these SO-DIMM modules are a great choice for upgrading your computer's memory capacity.