ALL HAVE BEEN TESTED & ARE IN WORKING CONDITIONS SOLD INDIVIDUAL & NOT AS A PAIR! The product is a single Samsung 8GB PC4-2666V server RAM module, specifically designed with ECC memory features. This ECC memory helps improve error correction and data integrity, making it ideal for server applications where reliable performance and data security are essential. The module has been tested and is ready for use in enhancing the performance and efficiency of server systems.