Micron DDR5 RDIMM 128GB 2Rx4 5600MHz CL46 32Gbit Single Pack Server Memory

Brand: Micron | Category: Memory (RAM)

SKU: MTC40F2047S1RC56BR | Part #: MTC40F2047S1RC56BR | MPN: MTC40F2047S1RC56BR

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Product Overview

The Micron DDR5 RDIMM 128GB 2Rx4 5600MT/s CL46 (32Gbit) is a flagship enterprise server memory module engineered to meet the demanding requirements of modern data centres, high-performance computing clusters, and AI-driven infrastructure. Built on Micron's advanced 32Gbit DRAM die technology, this registered dual in-line memory module (RDIMM) delivers an extraordinary 128GB of capacity in a single DIMM slot, enabling server architects to achieve unprecedented memory density without sacrificing performance or reliability.

DDR5 represents a generational leap over its predecessor, offering nearly double the bandwidth of DDR4 at equivalent frequencies. At 5600MT/s, this module pushes memory subsystem performance to levels previously unattainable in mainstream server platforms, making it an ideal choice for organisations deploying the latest Intel Xeon Scalable (Sapphire Rapids and Emerald Rapids) and AMD EPYC Genoa generation processors. Whether your infrastructure is running large-scale in-memory databases, training transformer-based AI models, or hosting hundreds of virtual machines, this Micron module provides the headroom your applications demand.

As a single-pack offering, this module is well suited for incremental capacity upgrades, mixed-configuration builds, and environments where precise per-channel memory population control is required. Its RDIMM architecture includes an onboard register component (RCD) that buffers command and address signals, reducing electrical loading on the memory controller and enabling higher-capacity, multi-rank configurations that raw UDIMM designs cannot support at this density.

Key Features & Benefits

• Massive 128GB Capacity per DIMM: Leveraging 32Gbit DRAM dies in a 2Rx4 dual-rank, x4-width organisation, this module maximises per-slot density, allowing servers with 8 or more DIMM slots to exceed 1TB of total system memory — a critical enabler for in-memory analytics and large language model inference.
• DDR5-5600 High Bandwidth: Operating at 5600MT/s with a maximum theoretical bandwidth of approximately 44.8 GB/s per module, this RDIMM dramatically accelerates memory-bound workloads such as genomics processing, financial risk modelling, and real-time fraud detection.
• CL46 Optimised Latency Profile: The CL46-45-45-90 timing profile is factory-tuned to balance access latency with sustained throughput, ensuring consistent performance across both sequential and random access patterns typical of enterprise database and virtualisation workloads.
• On-Die ECC (ODECC) & RAS Features: DDR5 introduces native on-die ECC, which corrects single-bit errors within each DRAM device before data is even transmitted to the memory controller. Combined with RDIMM's registered command/address buffering, this delivers a multi-layered error correction architecture that significantly improves data integrity in mission-critical deployments.
• Improved Power Efficiency: DDR5 operates at a native 1.1V VDD, compared to DDR4's 1.2V, reducing per-module power consumption. At 128GB capacity, this efficiency gain translates into meaningful TCO savings when dozens of modules are deployed across a rack.
• Integrated Voltage Regulation (PMIC): DDR5 RDIMMs incorporate a Power Management Integrated Circuit (PMIC) directly on the module, shifting voltage regulation responsibility from the motherboard VRM to the DIMM itself. This improves power delivery precision, reduces noise on the power rail, and enhances overall signal integrity at 5600MT/s speeds.
• Micron Quality & Reliability: Manufactured by Micron Technology — one of the world's three largest DRAM producers — this module undergoes rigorous qualification testing including thermal cycling, burn-in screening, and electrical characterisation, ensuring compliance with JEDEC DDR5 standards and server OEM validation requirements.
• Single-Pack Flexibility: Shipped as an individual module, this SKU offers procurement flexibility for organisations that need to populate specific DIMM slots, perform capacity upgrades on a per-channel basis, or maintain a qualified spare inventory without committing to full kit quantities.

Technical Architecture

The MTC40F2047S1RC56BR is organised in a 2Rx4 topology, meaning it uses two independent ranks of x4-width DRAM devices. The x4 device width provides a narrower per-device bus that, when combined with the higher device count per rank, delivers superior ECC coverage granularity — an important consideration for environments where uncorrectable error rates (UER) must be minimised. The module populates a standard 288-pin DDR5 RDIMM form factor and is designed for 1.1V operation.

At the heart of the module are Micron's 32Gbit (4GB) DRAM dies. The transition from 16Gbit to 32Gbit dies is what enables 128GB capacity in a single DIMM without increasing the physical PCB layer count or module height beyond standard RDIMM dimensions. This die-shrink also brings process-node improvements that contribute to the module's power efficiency and signal integrity characteristics.

The DDR5 RDIMM specification mandates the inclusion of a Registering Clock Driver (RCD02 or later) that independently buffers the command, address, and clock signals to each rank. This isolation prevents capacitive loading from cascading across multiple ranks, which is why DDR5 RDIMMs can be populated at high densities (2DPC — 2 DIMMs per channel) without the frequency derating penalties common in earlier DDR generations. The onboard PMIC further distinguishes DDR5 from DDR4 by managing the VDD, VDDQ, and VPP power rails internally, receiving a single 12V or 5V input from the server power delivery network.

Performance & Capacity

At 5600MT/s, each module delivers a peak theoretical bandwidth of approximately 44.8 GB/s (calculated as 5600MT/s × 64-bit bus width / 8 bits per byte). In a dual-channel server configuration with two such modules, aggregate bandwidth approaches 89.6 GB/s per processor socket — sufficient to sustain the data feed requirements of high-core-count CPUs engaged in parallel matrix computations, columnar database scans, or large-scale graph traversal operations.

The 128GB capacity per module means a 16-DIMM server (e.g., a dual-socket platform with 8 DIMM slots per CPU) can achieve 2TB of total system memory. For AI inference servers running large language models with billions of parameters, this capacity tier allows entire model weight sets to reside in DRAM, eliminating costly NVMe swap operations and reducing token generation latency by orders of magnitude compared to storage-tiered approaches.

Latency at CL46 with a 5600MT/s clock cycle time of approximately 0.357ns yields an absolute first-word latency (tAA) of roughly 16.4ns — competitive with high-performance DDR4-3200 modules and markedly better than equivalent-capacity DDR4 LRDIMMs that introduce additional load-reduction buffer latency.

Compatibility & Integration

This module is designed to comply with JEDEC DDR5 RDIMM standards and is intended for deployment in server platforms based on Intel Xeon Scalable 4th and 5th generation (Sapphire Rapids-SP, Emerald Rapids-SP) and AMD EPYC 9004 series (Genoa, Genoa-X) processors, both of which natively support DDR5 memory channels at up to 5600MT/s. Platform compatibility should be verified against the specific OEM's Memory Compatibility List (MCL) or Qualified Vendor List (QVL) prior to deployment.

• JEDEC DDR5 RDIMM standard compliant (JESD79-5B)
• 288-pin DDR5 RDIMM form factor
• Compatible with Intel Xeon Scalable 4th/5th Gen platforms (LGA4677 socket)
• Compatible with AMD EPYC 9004 series platforms (SP5 socket)
• Supported by major server OEMs including Dell PowerEdge, HPE ProLiant, Lenovo ThinkSystem, Supermicro, and Inspur platforms (subject to OEM QVL validation)
• Operating temperature: 0°C to 85°C (standard commercial; check datasheet for industrial grade)
• RoHS compliant; manufactured under ISO-certified quality management systems

Ideal Use Cases

• AI & Machine Learning Training: Large transformer model training requires terabytes of high-bandwidth memory access per training step. Populating servers with multiple 128GB DDR5-5600 modules enables the memory subsystem to match the throughput demands of GPU-to-CPU data staging pipelines.
• In-Memory Database Platforms: SAP HANA, Redis, VoltDB, and similar in-memory OLAP/OLTP engines benefit directly from large DRAM footprints. A 2TB+ memory server built with these modules can hold entire multi-hundred-gigabyte datasets in RAM, eliminating disk I/O bottlenecks entirely.
• High-Density Virtualisation: VMware vSphere, Microsoft Hyper-V, and KVM hypervisors allocate memory to virtual machines on a per-VM basis. Higher per-DIMM capacity allows the same physical server to host more VMs without adding nodes, reducing licensing costs and rack space consumption.
• Genomics & Life Sciences HPC: Genome assembly, variant calling, and protein folding simulations require both large working set memory and high bandwidth to feed CPU/GPU compute pipelines. DDR5-5600 at 128GB per DIMM is well-matched to these data-intensive workflows.
• Financial Risk & Real-Time Analytics: Monte Carlo simulations, real-time market data processing, and risk aggregation engines benefit from low-latency, high-throughput memory that can process millions of calculations per second with deterministic response times.
• Cloud & Hyperscale Infrastructure: Cloud providers building out multi-tenant compute nodes can maximise VM density per host by deploying maximum-capacity DDR5 RDIMMs, directly improving revenue-per-rack metrics and reducing the number of physical hosts required to serve a given tenant workload.

Why Buy from Omnixon

Omnixon Global is a specialist B2B IT hardware distributor headquartered in Dubai, UAE, with a focus on enterprise-grade components for clients across the GCC region and beyond. Our inventory of Micron memory modules — including high-density DDR5 RDIMMs — is stocked locally in Dubai, enabling rapid fulfilment for enterprise procurement teams, system integrators, and data centre operators operating across the UAE, Saudi Arabia, Qatar, Kuwait, Bahrain, Oman, and wider international markets. Our technical team understands the nuances of server memory qualification, population rules, and platform compatibility, and can assist customers in validating configurations before purchase. Every unit we supply is sourced through authorised distribution channels and arrives in original, sealed manufacturer packaging, ensuring full traceability and authenticity. Omnixon's enterprise focus means we are equipped to handle high-volume, project-based orders as well as individual module procurement, with the flexibility and responsiveness that enterprise IT timelines demand.

Related Products & Ecosystem

To build a complete, high-performance server memory solution, consider pairing this DDR5 RDIMM with complementary products available from Omnixon's portfolio. Enterprise servers from Dell, HPE, Lenovo, and Supermicro that support DDR5 platforms are ideal hosts for this module. High-performance CPUs including Intel Xeon Scalable 4th/5th Gen and AMD EPYC 9004 series processors are the natural compute partners. For storage tiering beneath the DRAM layer, enterprise NVMe SSDs and enterprise SAS/SATA HDDs provide the capacity and endurance required for data persistence. GPU accelerators for AI/ML workloads complement high-density memory configurations. Additionally, rack infrastructure including server enclosures, rack PDUs, and UPS power protection solutions ensure that high-density memory servers are housed and powered in an environment that matches their performance capabilities.