M321R2GA3EB2-CWM - 16GB DDR5-5600 ECC RDIMM | Samsung
MPN: M321R2GA3EB2-CWM ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $119 | $119.00 |
| 10 | $113 | $1,130.00 |
| 100 | $106 | $10,600.00 |
| 500 | $99 | $49,500.00 |
| 1,000 | $94 | $94,000.00 |
M321R2GA3EB2-CWM Overview
An RDIMM (Registered DIMM) is a server memory module that buffers the command and address signals through a register chip before they reach the DRAM devices. This buffering reduces electrical loading on the memory controller, allowing more DIMMs per channel and higher capacities than unbuffered UDIMMs. Within the memory hierarchy, DDR5 SDRAM is the current-generation JEDEC DRAM standard, and RDIMMs are the mainstream server-class implementation sitting below load-reduced LRDIMMs in enterprise platforms.
Key features include 5600 MT/s data rate (PC5-44800), on-die ECC plus link ECC for data integrity, a registered clock driver that isolates the memory controller from DRAM loads, and DDR5 on-module PMIC (power management IC) that regulates the 1.1V supply locally on the module for cleaner power delivery. The x8 single-rank organization keeps command latency low with a 46-clock CAS latency.
DDR5 doubles the number of independent banks per bank group and splits each module into two independent 32-bit sub-channels, improving memory-level parallelism and effective bandwidth for multi-core server processors. The M321R2GA3EB2-CWM conforms to the JEDEC DDR5 RDIMM standard and installs in any 288-pin DDR5 RDIMM slot at 1.1V.
Typical applications include entry-level virtualization hosts, edge compute appliances, small and mid-size business servers, and memory expansion for professional workstations running databases, web serving, and AI/ML inference workloads.
Design consideration: verify that your platform BIOS and CPU memory controller support 5600 MT/s RDIMMs; on platforms rated lower, the module will down-clock automatically, which is safe but reduces bandwidth.
This page adds value beyond the datasheet by aggregating distributor stock status, drop-in alternatives such as the DDR5-6400 M321R2GA3EB2-CCP, third-party compatible modules, and practical platform-compatibility guidance in one citable reference.
Drop-in alternatives for M321R2GA3EB2-CWM — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with M321R2GA3EB2-CWM (same form factor and footprint) — differing in Form Factor, Module Type, ECC, Speed, CAS Latency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
M321R2GA3EB2-CCP
✅ Drop-In✓ In Stock
$74 / Unit
View Datasheet →M321R2GA3PB0-CWM
✅ Drop-In✓ In Stock
$37.5 / Unit
View Datasheet →M321R2GA3PB1-CCP
✅ Drop-In📋 Reference alternative (not in catalog)
NEMIX RAM M321R2GA3EB2-compatible 16GB DDR5-5600 RDIMM
✅ Drop-In📋 Reference alternative (not in catalog)
A-Tech 16GB DDR5-6400 PC5-51200R RDIMM
✅ Drop-In📋 Reference alternative (not in catalog)
NEMIX RAM 16GB DDR5-6400 PC5-51200 CL52 1Rx8 RDIMM
✅ Drop-In📋 Reference alternative (not in catalog)
M321R2GA3EB2-CWM Maximum Ratings & Electrical Characteristics
| Memory Capacity | 16 GB |
| Memory Type | DDR5 SDRAM |
| Module Type | RDIMM (ECC Registered DIMM) |
| Data Rate | 5600 MT/s |
| PC Rating | PC5-44800 |
| CAS Latency | CL46 |
| Operating Voltage | 1.1 V |
| Rank | Single Rank (1Rx8) |
| Organization | x8 |
| Pins | 288-pin |
| Form Factor | DIMM (288-pin DDR5) |
| ECC | Yes (ECC Registered) |
| On-module PMIC | Yes (DDR5 standard) |
| Condition | Brand New |
| Primary Application | Server / Workstation |
| RoHS Status | unknown |
M321R2GA3EB2-CWM standard Pin Configuration Guide
Pin configuration for M321R2GA3EB2-CWM (standard package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for M321R2GA3EB2-CWM.
Refer to the datasheet for full pin configuration.
Typical Applications
M321R2GA3EB2-CWM is suitable for 6 applications: Entry-Level Virtualization Hosts, Edge Compute Appliances, Small and Mid-Size Business Servers, AI/ML Inference and Analytics Workloads, Professional Workstation Memory Expansion, Database and Storage Servers.
Entry-Level Virtualization Hosts
The M321R2GA3EB2-CWM fits entry-level virtualization servers because its 5600 MT/s data rate (PC5-44800) supplies roughly 44.8 GB/s per module of peak bandwidth, sufficient for running multiple VMs whose aggregate memory traffic rarely saturates a dual-channel-per-CPU server configuration at modest DIMM counts. Its ECC Registered architecture corrects single-bit errors that could otherwise crash a hypervisor hosting several tenants, and the registered buffer keeps signal integrity stable at two DIMMs per channel. Installed across all eight or twelve channels of a Xeon or EPYC socket, single-rank 1Rx8 modules minimize controller loading and keep command latency low with CL46 timing at 1.1V. A trade-off: 16GB per module means capacity-dense workloads need many slots, so growth may require moving to 32GB or 64GB modules later.
Recommended
Edge Compute Appliances
In edge compute and micro-data-center appliances, the M321R2GA3EB2-CWM offers a balance of capacity, bandwidth, and power efficiency. Its 1.1V operating voltage and single-rank organization reduce per-module power draw versus dual-rank alternatives, which matters in fanless or convection-cooled edge enclosures with limited airflow and strict thermal budgets. DDR5's on-module PMIC delivers cleaner local power rails, improving reliability in electrically noisy industrial edge environments where supply quality varies. The 5600 MT/s rate comfortably feeds edge AI inference accelerators and local analytics workloads streaming sensor data. ECC Registered protection prevents silent data corruption during long unattended operation cycles typical of remote deployments. A design consideration: verify the appliance BIOS supports 5600 MT/s RDIMMs, since some cost-optimized edge platforms cap at 4800 MT/s and will down-clock the module.
Recommended
Small and Mid-Size Business Servers
For SMB file, web, and database servers built on Dell PowerEdge, HPE ProLiant, Lenovo ThinkSystem, or Supermicro DDR5 platforms, the M321R2GA3EB2-CWM provides a cost-efficient per-gigabyte entry point. A typical configuration of 64GB to 128GB (4 to 8 modules) fills all memory channels symmetrically, and the single-rank 1Rx8 design allows two DIMMs per channel at the full 5600 MT/s bin on most platforms, maximizing bandwidth without dropping to a lower speed. The ECC Registered circuitry is essential in these environments since uncorrected memory errors corrupt transactional databases. Distributors list this module as brand new and in stock as of 2026-09-04, simplifying procurement for short-lead-time server builds. Note that mixing this module with existing dual-rank memory forces matched-population rules; keep channels uniform for guaranteed JEDEC timing.
Recommended
AI/ML Inference and Analytics Workloads
AI inference nodes, vector databases, and analytics appliances benefit from the M321R2GA3EB2-CWM's 5600 MT/s bandwidth when models and datasets are memory-resident. DDR5's two independent 32-bit sub-channels per module improve effective utilization for the streaming, bursty access patterns of inference serving, while the x8 organization and CL46 timing keep random-access latency predictable for embedding lookups and KV-cache operations. For GPU-accelerated servers, host memory bandwidth often becomes the bottleneck during data prefetch and pre/post-processing; populating all CPU channels with single-rank modules sustains consistent throughput. The ECC Registered design protects long-running inference jobs against soft errors. For memory-bandwidth-critical training-scale workloads, consider the 6400 MT/s M321R2GA3EB2-CCP sibling instead, since roughly 14% more bandwidth materially reduces dataloader stalls.
Recommended
Professional Workstation Memory Expansion
High-end workstations built on Xeon W or Threadripper PRO platforms that accept RDIMMs can use the M321R2GA3EB2-CWM for reliable 16GB-per-module expansion in CAD, simulation, and content-creation builds. The 5600 MT/s rate matches the standard memory bin of current workstation CPUs, and ECC protects multi-hour render and solve jobs from a single flipped bit that would otherwise waste an entire run. Its 1.1V operation keeps total module power low, easing workstation thermal design under sustained all-core loads. The 288-pin registered format is electrically identical whether in a server chassis or tower workstation, so system integrators can stock one SKU across both product lines. A caveat: consumer desktop platforms requiring UDIMMs cannot accept this module; it is strictly for RDIMM-capable sockets.
Recommended
Database and Storage Servers
Transactional database servers (MySQL, PostgreSQL, SQL Server) and storage controllers depend on memory integrity, making the M321R2GA3EB2-CWM's ECC Registered architecture a requirement rather than an option. The on-die ECC of DDR5 plus module-level link ECC protects data in flight between the memory controller and DRAM, while registered buffering supports the larger DIMM populations database servers need for buffer pools and caches. Its 5600 MT/s speed with CL46 latency provides the low, consistent read latency that OLTP query performance depends on, and the single-rank organization yields slightly faster rank-to-rank turnaround than dual-rank equivalents in lightly populated channels. For memory-heavy in-memory databases, plan capacity growth with dual-rank or higher-density modules in the same Samsung DDR5 RDIMM family to maintain channel uniformity across upgrades.
Recommended
Recommended Products Summary
Engineering reference data for M321R2GA3EB2-CWM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | M321R2GA3EB2-CCP | M321R2GA3PB0-CWM | NEMIX RAM M321R2GA3EB2-compatible 16GB DDR5-5600 RDIMM |
|---|---|---|---|---|
| Package | 288-pin DDR5 RDIMM | 288-pin DDR5 RDIMM - same | 288-pin DDR5 RDIMM - same | 288-pin DDR5 RDIMM - same |
| Brand | Samsung Electronics | Samsung Electronics | Samsung Electronics | NEMIX RAM |
| Capacity | 16 GB | 16 GB | 16 GB | 16 GB |
| Data Rate | 5600 MT/s (PC5-44800) | 6400 MT/s (PC5-51200) | 5600 MT/s (PC5-44800) | 5600 MT/s (PC5-44800) |
| Rank / Organization | 1Rx8 (Single Rank) | 1Rx8 (Single Rank) | PB0 family (see datasheet) | 1Rx8 (Single Rank) |
| Voltage | 1.1 V | 1.1 V | 1.1 V | 1.1 V |
| ECC / Registration | ECC Registered | ECC Registered | ECC Registered | ECC Registered |
Key Differentiators
- Power-efficient 5600 MT/s single-rank design (vs M321R2GA3EB2-CCP)
- Samsung original silicon with ECC Registered (vs NEMIX RAM M321R2GA3EB2-compatible 16GB DDR5-5600 RDIMM)
- Single-rank 1Rx8 minimizes controller loading (vs M321R2GA3PB0-CWM)
Design Notes
Before purchasing, confirm the platform's validated memory QVL and supported DDR5 speed bin. The M321R2GA3EB2-CWM is a 5600 MT/s (PC5-44800) CL46 RDIMM; on platforms validated only to 4800 MT/s, SPD auto-negotiation will down-clock the module safely, but you lose ~14% bandwidth versus a properly matched platform. Never mix UDIMMs with this RDIMM in the same system - registered and unbuffered modules cannot coexist on a DDR5 channel.
Populate DIMM slots symmetrically across all memory channels per CPU, using identical capacity, rank, and speed bin in each channel. Mixing single-rank (this 1Rx8 module) with dual-rank modules in the same channel typically forces the channel to a lower speed bin per JEDEC DDR5 margining rules. Follow the server vendor's population-order table (usually white/black slot ordering) to maintain proper trace stub termination and signal integrity at 5600 MT/s.
Each DDR5 RDIMM carries an on-module PMIC converting the 5V aux supply to the 1.1V DRAM rail, so per-module power is governed by the PMIC efficiency rather than the platform VRM. A 16GB 1Rx8 module typically draws on the order of a few watts under load (estimate based on DDR5 1.1V standard operation, not a datasheet figure). Ensure the server chassis provides adequate airflow across DIMM heat spreaders, since sustained 5600 MT/s traffic raises module temperature in dense 24-DIMM configurations.
Compliance Information
Compliance details were not stated in the provided distributor listings. Samsung DDR5 RDIMMs are generally RoHS-compliant, but this must be confirmed from official Samsung documentation before citing; contact the vendor for declarations.
