LRDIMM — Load-Reduced DIMM
Definition
A type of server memory module with an integrated memory buffer that decouples the DRAM chips from the memory channel. LRDIMMs enable higher per-DIMM densities (128 GB and beyond) at full bus speeds.
Context & Usage
LRDIMMs replace the register chip used in RDIMMs with a full memory buffer that handles all data, address, and command signals. This allows the memory controller to see fewer electrical loads per channel — making 8-rank LRDIMM configurations possible at full speed. Used in high-capacity database servers, SAP HANA, and large-memory VDI hosts. Cost is typically 20-40% higher than equivalent RDIMM capacity but enables configurations RDIMMs cannot reach.
Examples
- Samsung M386AAG40BM3-CWE (128 GB DDR4-3200 LRDIMM)
- Hynix HMAA8GL7CMR4N-XN (64 GB DDR4-3200 LRDIMM)
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