The Nanya NT256T64UH4AQFY-37B PC2-4200U-444-12-C1 memory RAM is a set of two DIMM modules with a total capacity of 512 MB. Each module has a capacity of 256 MB, and they are designed for use in computers that support PC2-4200 bus speeds. The memory modules are of SDR SDRAM type and have a reliable brand reputation from Nanya. This RAM is a suitable option for upgrading or replacing existing memory modules in computers for improved performance and capacity.