RDIMM — Registered DIMM
Definition
A type of server memory module that uses a register chip to buffer address and command signals between the memory controller and DRAM chips. RDIMMs improve electrical signal integrity, allowing more DIMMs per memory channel than unbuffered memory.
Context & Usage
RDIMMs are the most common server memory type, used in nearly every enterprise server platform from Dell PowerEdge to HPE ProLiant to Lenovo ThinkSystem. The register adds about one clock cycle of latency vs unbuffered memory, but enables 2-3× more DIMM slots per channel. Standard server configurations populate 16-32 RDIMM slots per CPU socket with capacities from 8 GB up to 128 GB per module.
Examples
- Samsung M393A4K40DB3 (32 GB DDR4-3200 RDIMM)
- Micron MTA36ASF8G72PZ-3G2 (64 GB DDR4-3200 RDIMM)
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