This Hynix 1GB DDR2 SDRAM memory kit contains four 1GB RAM modules, with a total capacity of 1GB. Each module has a capacity of 1GB and operates at a bus speed of PC2-5300 (DDR2-667). The memory kit is designed for use with desktop computers and is compatible with most DDR2-capable systems. Whether you're upgrading an older system or building a new one from scratch, this Hynix memory kit is an excellent choice for boosting performance and multitasking capabilities.