sold as a pairThe G.Skill PC2-6400 4 GB DIMM 1000 MHz DDR2-800 SDRAM memory module pair offers a total capacity of 8 GB with each module having a capacity of 4 GB. These DDR2 SDRAM modules are designed to enhance the performance of computers and are manufactured by G. Skill in Taiwan. The DIMM form factor ensures compatibility with various computer systems, making it a reliable choice for upgrading or replacing existing memory modules.