The NANYA 4GB (4x1GB) 2Rx8 DDR2 PC2-5300F ECC NT1GT72U8PA5BD-3C RAM is a set of four DDR2 SDRAM DIMM modules with a total capacity of 4GB. Each module has a capacity of 1GB and features ECC memory, making it ideal for server applications. The memory has a bus speed of PC2-5300 (DDR2-667) and is designed for enterprise networking and server use. With its high-quality construction and reliable performance, this RAM is a versatile option for enhancing the performance and efficiency of server systems.