The Samsung 4GB 2Rx4 PC2-5300P M393T5160QZA is a set of two DDR2 SDRAM memory modules with a total capacity of 8GB. Each module has a capacity of 4GB, and they are designed in the SO-DIMM form factor. These memory modules are specifically manufactured by Samsung and feature a PC2-5300 bus speed, making them compatible with DDR2-667 systems. They are registered memory modules and have a country of origin of the United States. Ideal for upgrading or replacing memory modules in computers, these Samsung modules offer reliable performance and capacity for enhancing system efficiency.