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Samsung M321RAGA0B20-CWK 128GB DDR5-4800 ECC RDIMM Server Memory
The Samsung M321RAGA0B20-CWK is a high-capacity 128GB DDR5-4800 ECC Registered DIMM (RDIMM) designed for enterprise servers, data-center infrastructure, virtualization platforms, and high-performance computing environments.
Featuring 128GB capacity, DDR5-4800 performance, ECC error correction, quad-rank 4Rx4 organization, 288-pin construction, 1.1V operation, and PC5-38400 bandwidth, this Samsung server memory module is designed for high-density memory configurations and demanding enterprise workloads.
Description
The Samsung M321RAGA0B20-CWK is a 128GB DDR5 server memory module engineered for platforms supporting ECC Registered DDR5 RDIMM memory.
With a rated transfer speed of 4800 MT/s, the module provides high memory bandwidth for modern server processors. Its ECC capability helps improve data integrity, while the registered architecture supports high-density memory configurations on compatible server platforms.
The module uses a quad-rank 4Rx4 organization, 288-pin DIMM form factor, and 1.1V operating voltage. It is specified as DDR5-4800 / PC5-38400 memory.
The module is configured as 1 × 128GB, providing substantial memory capacity from a single DIMM slot and allowing compatible servers to achieve high total RAM capacity while preserving additional slots for expansion.
Key Specifications
| Specification | Details |
|---|---|
| Manufacturer | Samsung |
| Part Number | M321RAGA0B20-CWK |
| Product Type | Server Memory Module |
| Capacity | 128GB |
| Memory Technology | DDR5 SDRAM |
| Memory Speed | DDR5-4800 |
| Data Rate | 4800 MT/s |
| PC Standard | PC5-38400 / PC5-38400R |
| Module Type | ECC Registered DIMM (RDIMM) |
| ECC | Yes |
| Registered | Yes |
| Rank | Quad Rank |
| Organization | 4Rx4 |
| DRAM Organization | 4G × 4 |
| DRAM Packages | 40 FBGA |
| Module Organization | 16G × 72 |
| Form Factor | DIMM |
| Pins | 288-pin |
| Voltage | 1.1V |
| CAS Latency | Source-dependent; verify exact module documentation |
| Memory Standard | JEDEC DDR5 |
| Configuration | 1 × 128GB |
| Application | Server / Data Center |
The exact module is documented as 128GB DDR5-4800 ECC RDIMM, 4Rx4, 288-pin, 1.1V by multiple memory references.
128GB High-Capacity Memory
With 128GB of capacity in a single DIMM, the M321RAGA0B20-CWK is designed for high-density server memory configurations.
A single 128GB module can substantially increase available system RAM while leaving additional DIMM slots available for future expansion, subject to the server’s memory architecture and population requirements.
Recommended workloads include:
- Enterprise virtualization
- Large database systems
- Cloud infrastructure
- Data analytics
- Artificial intelligence and compute workloads
- High-performance computing
- In-memory applications
- Storage servers
- Enterprise application servers
- Large-scale professional workloads
The maximum supported memory depends on the server model, processor, BIOS/firmware, memory controller, and DIMM population rules.
With a rated transfer speed of 4800 MT/s, the module provides high memory bandwidth for modern server processors. Its ECC capability helps improve data integrity, while the registered architecture supports high-density memory configurations on compatible server platforms.
The module uses a quad-rank 4Rx4 organization, 288-pin DIMM form factor, and 1.1V operating voltage. It is specified as DDR5-4800 / PC5-38400 memory.
The module is configured as 1 × 128GB, providing substantial memory capacity from a single DIMM slot and allowing compatible servers to achieve high total RAM capacity while preserving additional slots for expansion.
Key Specifications
| Specification | Details |
|---|---|
| Manufacturer | Samsung |
| Part Number | M321RAGA0B20-CWK |
| Product Type | Server Memory Module |
| Capacity | 128GB |
| Memory Technology | DDR5 SDRAM |
| Memory Speed | DDR5-4800 |
| Data Rate | 4800 MT/s |
| PC Standard | PC5-38400 / PC5-38400R |
| Module Type | ECC Registered DIMM (RDIMM) |
| ECC | Yes |
| Registered | Yes |
| Rank | Quad Rank |
| Organization | 4Rx4 |
| DRAM Organization | 4G × 4 |
| DRAM Packages | 40 FBGA |
| Module Organization | 16G × 72 |
| Form Factor | DIMM |
| Pins | 288-pin |
| Voltage | 1.1V |
| CAS Latency | Source-dependent; verify exact module documentation |
| Memory Standard | JEDEC DDR5 |
| Configuration | 1 × 128GB |
| Application | Server / Data Center |
The exact module is documented as 128GB DDR5-4800 ECC RDIMM, 4Rx4, 288-pin, 1.1V by multiple memory references.
128GB High-Capacity Memory
With 128GB of capacity in a single DIMM, the M321RAGA0B20-CWK is designed for high-density server memory configurations.
A single 128GB module can substantially increase available system RAM while leaving additional DIMM slots available for future expansion, subject to the server’s memory architecture and population requirements.
Recommended workloads include:
- Enterprise virtualization
- Large database systems
- Cloud infrastructure
- Data analytics
- Artificial intelligence and compute workloads
- High-performance computing
- In-memory applications
- Storage servers
- Enterprise application servers
- Large-scale professional workloads
The maximum supported memory depends on the server model, processor, BIOS/firmware, memory controller, and DIMM population rules.
DDR5-4800 Performance
The M321RAGA0B20-CWK operates at DDR5-4800, providing a rated transfer rate of 4800 MT/s and PC5-38400 memory bandwidth.
DDR5-4800 is designed for modern server processors and provides high memory bandwidth for data-intensive workloads.
Actual operating speed can depend on:
- Server model
- Processor generation
- CPU memory controller
- BIOS/firmware
- Number of installed DIMMs
- DIMM population
- Memory-channel configuration
- Server manufacturer specifications
A compatible platform may operate the memory below its maximum rated speed depending on system configuration.
ECC Error Correction
The M321RAGA0B20-CWK features ECC (Error-Correcting Code) memory technology.
ECC is designed to detect and correct certain memory errors, helping improve data integrity and system reliability in professional computing environments.
This makes ECC RDIMM memory particularly suitable for:
- Enterprise servers
- Virtualization hosts
- Database servers
- Storage systems
- Cloud infrastructure
- Data centers
- High-performance computing
- Mission-critical applications
The exact Samsung part is identified as ECC Registered DDR5 memory by multiple technical references.
Registered DIMM Architecture
The M321RAGA0B20-CWK uses Registered DIMM (RDIMM) architecture.
RDIMM technology incorporates registers to buffer memory command and control signals, allowing compatible server platforms to support high-density memory configurations.
RDIMM, UDIMM, and SODIMM are different memory technologies and are not interchangeable.
The target server must specifically support DDR5 ECC Registered RDIMM memory.
Quad-Rank 4Rx4 Organization
The module uses a quad-rank 4Rx4 organization.
| Memory Characteristic | Specification |
|---|---|
| Capacity | 128GB |
| Rank Configuration | 4R |
| Data Organization | x4 |
| Module Organization | 4Rx4 |
| Module Organization | 16G × 72 |
| DRAM Organization | 4G × 4 |
| DRAM Packages | 40 FBGA |
The 4Rx4 configuration is an important compatibility characteristic and should be checked against the server manufacturer’s supported memory configurations before installation.
288-Pin DDR5 DIMM
The Samsung M321RAGA0B20-CWK uses a 288-pin DDR5 DIMM form factor.
However, 288-pin construction alone does not guarantee compatibility.
The target server must also support:
- DDR5 memory
- ECC
- Registered DIMMs
- 128GB DIMMs
- 4Rx4 organization
- DDR5-4800 operation
- The required memory-channel configuration
Server & Data-Center Applications
The M321RAGA0B20-CWK is intended for professional server and data-center environments.
Recommended applications include:
- Enterprise servers
- Data-center infrastructure
- Virtualization platforms
- Database servers
- Cloud computing
- AI and compute infrastructure
- High-performance computing
- Storage systems
- Enterprise application servers
- Telecom infrastructure
- Engineering and professional computing
The exact Samsung part number is listed in technical references as a 128GB DDR5-4800 ECC Registered RDIMM with 4Rx4 organization.
Memory Population & Configuration
When installing multiple DIMMs, follow the server manufacturer’s recommended memory population sequence.
For predictable compatibility and performance, matching modules by:
- Capacity
- Memory technology
- Speed
- Rank
- Organization
- ECC configuration
- Registered architecture
- Manufacturer
- Part number
is recommended.
Because this is a 4Rx4 high-capacity RDIMM, the server’s supported rank configuration and DIMM population rules should be verified before purchase.
Compatibility Considerations
Before purchasing or installing the M321RAGA0B20-CWK, verify that the target system supports:
- DDR5 ECC RDIMM
- 128GB DIMMs
- DDR5-4800
- 4Rx4 memory organization
- 288-pin DDR5 DIMMs
- 1.1V DDR5 memory
- The required DIMM population configuration
The exact part is listed for compatible server platforms including examples such as Dell PowerEdge MX760c and R760, but qualification for a particular server does not guarantee compatibility with every DDR5 server.
Important Memory Mixing Note
The M321RAGA0B20-CWK is a Registered ECC RDIMM with a 4Rx4 organization.
It should not be mixed indiscriminately with:
- DDR5 UDIMM
- DDR5 SODIMM
- LRDIMM
- Non-ECC memory
- Unsupported rank configurations
For best results, use memory configurations approved by the server manufacturer and follow the recommended DIMM population order.
Key Features & Benefits
- 128GB high-capacity memory
- Samsung enterprise server memory
- DDR5 technology
- DDR5-4800 performance
- 4800 MT/s data rate
- PC5-38400 / PC5-38400R
- ECC error correction
- Registered DIMM architecture
- Quad-rank 4Rx4 organization
- 288-pin DDR5 DIMM
- 1.1V operating voltage
- 40 FBGA DRAM packages
- 16G × 72 module organization
- Designed for enterprise server platforms
- Suitable for virtualization and database workloads
- Suitable for cloud and data-center infrastructure
- Suitable for AI and high-performance computing
- High-density single-DIMM capacity
Important Compatibility Note
The Samsung M321RAGA0B20-CWK is a 128GB DDR5 ECC Registered DIMM (RDIMM) and should be marketed specifically as server memory.
It is not a standard consumer DDR5 desktop UDIMM or laptop SODIMM.
RDIMM, UDIMM, and SODIMM technologies are different and generally cannot be substituted for one another.
Always verify the target system’s:
- Server model
- CPU generation
- Motherboard
- BIOS/firmware
- Maximum supported memory
- RDIMM support
- 128GB DIMM support
- 4Rx4 support
- DIMM population rules
- Supported memory frequency
before ordering.
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