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Memory

Server memory is sold primarily as RDIMM (Registered DIMM) or LRDIMM (Load-Reduced DIMM). RDIMM is the standard choice for most single- and dual-socket servers and offers a good balance of capacity, speed, and cost. LRDIMM supports higher maximum capacities per channel and is typically used in memory-dense configurations where every DIMM slot is populated with large modules. Almost all server memory is ECC (Error-Correcting Code), which detects and corrects in-memory data corruption — this is a requirement, not an option, for production server workloads. When upgrading an existing server, match the existing generation (DDR4 or DDR5), speed rating, and rank/width where possible, since mixing incompatible modules can force the whole channel down to the slowest common speed or prevent the system from booting.