HP GL639AVR 1GB Kit (2x512MB) DDR2-667MHz FB-DIMM 1Rx8 CL5 Memory

Product Description

The HP GL639AVR is a 1GB memory kit comprised of two 512MB DDR2 Fully Buffered DIMM (FB-DIMM) modules. This configuration is specifically designed for server and workstation platforms that require the advanced memory architecture provided by FB-DIMMs. These modules operate at a frequency of 667MHz, corresponding to a PC2-5300F speed rating, which offers substantial bandwidth for demanding enterprise applications. The inclusion of ECC (Error-Correcting Code) functionality ensures data integrity, a critical feature for mission-critical server environments where data accuracy is paramount. Each module in the kit is configured as 1Rx8, meaning it is single-rank with eight memory chips per rank. This configuration is common for FB-DIMMs and is optimized for the way the Advanced Memory Buffer (AMB) chip on the FB-DIMM handles data requests. The CAS Latency (CL) is rated at 5, indicating the number of clock cycles required to access data from the memory array. This CL5 rating, combined with the 667MHz speed, provides a balance of responsiveness and throughput suitable for high-performance computing tasks. The FB-DIMM technology itself was developed to overcome the scalability limitations of traditional DDR2 unbuffered and registered DIMMs, particularly in systems with many memory modules. It achieves this by placing an Advanced Memory Buffer (AMB) chip on each DIMM, which serializes data transfers between the memory controller and the DRAM chips. This reduces the electrical load on the memory controller, allowing for higher densities and more memory channels. The GL639AVR kit is a reliable component for upgrading or maintaining server systems that utilize this specific type of memory.