The Samsung 16GB 2RX8 PC4-2666V-UB1-11 M378A1K43DB2 -CTD Memory / RAM is a set of two DDR4 SDRAM memory modules with a total capacity of 16GB each. Made by Samsung and manufactured in China, these modules have a bus speed of PC4-21300 (DDR4-2666) and 288 pins. Designed for high performance and reliability, these memory modules are ideal for upgrading or replacing existing RAM in computers that support DDR4 memory technology.