ALL HAVE BEEN TESTED & ARE IN WORKING CONDITIONS SOLD INDIVIDUAL & NOT AS A PAIR! The Samsung 8GB 1Rx8 PC4-2666v DDR4 memory module is a high-quality RAM module designed for desktop computers. With a total capacity of 8GB and a bus speed of PC4-21300 (DDR4-2666), this module provides fast and efficient performance for your computing needs. The UDIMM form factor and DDR4 SDRAM type ensure compatibility with a wide range of desktop configurations. Made by Samsung, a trusted brand in computer components, this memory module offers reliability and stability for your system.