Specifications
Module Type
MRDIMM (Multiplexed Rank DIMM / MCRDIMM)
Capacity
256 GB
Data Rate
8800 MT/s
Platform
Intel Xeon 6 processors
Bandwidth Gain
Up to 39% over DDR5 RDIMM
Latency
Up to 40% lower than RDIMM
Bus Efficiency
+15% versus RDIMM
On-Module Logic
MRCD multiplexer register clock driver + MDB data buffers
Operating Mode
Two DDR ranks accessed simultaneously in multiplexed mode
Module Speed vs Ranks
Host interface runs at 8800 MT/s; on-module devices run at half rate
Capacity Range
MRDIMM family spans 32 GB to 256 GB
Power
Module power held to a predictable budget by half-rate on-module operation
Next Generation
12800 MT/s MRDIMM generation under development
Use Case
Memory-bandwidth-bound AI and HPC workloads
Overview
Micron DDR5 MRDIMM (Multiplexed Rank DIMM, also written MCRDIMM) is a server memory module that places a multiplexer on the DIMM itself so two DDR5 ranks can be accessed simultaneously. The host CPU therefore sees an 8800 MT/s interface while the DRAM devices on the module continue to run at half that rate.
That architecture is what delivers the headline gains: up to 39% more bandwidth than DDR5 RDIMM, up to 40% lower latency, and 15% better bus efficiency, all without pushing the DRAM die themselves past their comfortable operating point. The on-module silicon consists of an MRCD (multiplexer register clock driver) plus MDB (multiplexer data buffer) chips.
The 256 GB module is the top of the MRDIMM capacity stack. As core counts per socket rise, per-core memory bandwidth is the binding constraint on AI and HPC throughput — which is exactly the problem MRDIMM is designed to solve on Intel Xeon 6 platforms.
Key Benefits
256 GB per module — maximum MRDIMM capacity for dense servers. 39% more bandwidth than the equivalent RDIMM. 40% lower latency for capacity- and bandwidth-sensitive AI workloads.
Applications
Intel Xeon 6 AI inference and training nodes, HPC clusters, in-memory databases, real-time analytics, and virtualisation hosts where per-core memory bandwidth limits performance.
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