The HP 397411-B21 398706-051 416471-001 2GB Dual (2X1GB) PC2-5300 is a server memory module designed for enterprise networking and server applications. This DDR2 FB-DIMM SDRAM module has a total capacity of 2GB, with each module containing 1GB of memory. It operates at a bus speed of PC2-5300 (DDR2-667) and has 240 pins for compatibility with various server components. With a reputable brand like HP, this memory module offers reliable performance and is ideal for businesses looking to enhance their server capabilities.