ALL HAVE BEEN TESTED & ARE IN WORKING CONDITIONS SOLD INDIVIDUAL & NOT AS A PAIR! The Samsung 8GB 1Rx8 PC4 2666 RAM Memory DDR4 is a high-quality memory module designed for optimal performance in computers and laptops. With a total capacity of 8GB and a bus speed of PC4-21300 (DDR4-2666), this DIMM module offers fast and efficient data processing for improved system performance. The Samsung brand ensures reliability and quality, making it a dependable choice for upgrading your computer's memory capacity.