Samsung M321R4GA3BB0-CQK 32GB DDR5 server memory module
Samsung M321RAGA0B20-CWK 128GB DDR5-4800 ECC RDIMM Server Memory
Samsung 64GB DDR5 server memory module
The Samsung M321R8GA0BB0-CQK is a high-capacity 64GB DDR5-4800 ECC Registered DIMM (RDIMM) designed for enterprise servers, data-center infrastructure, and professional computing platforms.
Featuring 64GB capacity, DDR5-4800 performance, ECC error correction, dual-rank 2Rx4 organization, 288-pin construction, and 1.1V operation, this Samsung server memory module provides high-density, reliable memory for demanding enterprise workloads.
Description
The Samsung M321R8GA0BB0-CQK is a 64GB DDR5 server memory module engineered for platforms supporting ECC Registered DDR5 RDIMM memory.
Operating at 4800 MT/s, the module provides high memory bandwidth for modern server processors. Its ECC capability helps detect and correct certain memory errors, while the registered architecture buffers memory command and control signals for reliable operation in supported high-density server configurations.
The module uses a dual-rank 2Rx4 organization, a 288-pin DIMM form factor, and 1.1V operating voltage. It is specified as DDR5-4800 / PC5-38400 memory.
The exact part number is also listed in server qualification documentation. MSI’s server memory qualification documentation identifies the Samsung family as DDR5 Registered, 4800MT/s, 64GB, 2R×4, ECC.
Key Specifications
| Specification | Details |
|---|---|
| Manufacturer | Samsung |
| Part Number | M321R8GA0BB0-CQK |
| Product Type | Server Memory Module |
| Capacity | 64GB |
| 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 | Dual Rank |
| Organization | 2Rx4 |
| DRAM Organization | 4G × 4 |
| DRAM Packages | 40 FBGA |
| Module Organization | 8G × 72 |
| Form Factor | DIMM |
| Pins | 288-pin |
| Voltage | 1.1V |
| Memory Standard | JEDEC DDR5 |
| Configuration | 1 × 64GB |
| Application | Server / Professional Computing |
The exact M321R8GA0BB0-CQK is documented as a 64GB DDR5-4800 ECC RDIMM, 2Rx4, 288-pin, 1.1V module.
64GB High-Capacity Memory
With 64GB of capacity in a single DIMM, the M321R8GA0BB0-CQK provides substantial memory density for compatible server platforms.
A 64GB module can help increase total system RAM while leaving additional DIMM slots available for future expansion, depending on the server’s memory architecture.
It is suitable for workloads such as:
- Server virtualization
- Database applications
- Cloud infrastructure
- Enterprise applications
- Data analytics
- Storage systems
- Application servers
- High-performance computing
- AI and compute workloads
- Professional workstation applications
The maximum supported memory depends on the server model, processor, motherboard, BIOS/firmware, and DIMM population rules.
DDR5-4800 Performance
The M321R8GA0BB0-CQK operates at DDR5-4800, providing a rated transfer rate of 4800 MT/s and PC5-38400 memory specification.
DDR5-4800 is designed for modern server processors and provides increased memory bandwidth compared with previous-generation DDR4 server memory.
Actual operating speed may depend on:
- Server model
- Processor memory controller
- BIOS/firmware
- CPU generation
- Number of installed DIMMs
- DIMM population
- Memory-channel configuration
- Server manufacturer specifications
A compatible server may operate the memory at a lower frequency when required by its platform configuration.
ECC Error Correction
The M321R8GA0BB0-CQK uses ECC (Error-Correcting Code) memory technology.
ECC is designed to detect and correct certain memory errors, helping improve data integrity and system reliability in enterprise computing environments.
This makes the module suitable for:
- Enterprise servers
- Virtualization hosts
- Database servers
- Storage systems
- Data-center infrastructure
- Cloud platforms
- High-performance computing
- Mission-critical applications
The exact part is identified as ECC Registered RDIMM by multiple technical references.
Registered DIMM Architecture
The Samsung M321R8GA0BB0-CQK uses Registered DIMM (RDIMM) architecture.
RDIMM technology uses a register to buffer memory command and control signals, supporting higher-density memory configurations on compatible server platforms.
RDIMM, UDIMM, and SODIMM memory are different technologies and are not interchangeable.
The target system must specifically support DDR5 ECC Registered RDIMM memory.
Dual-Rank 2Rx4 Organization
The module uses a dual-rank 2Rx4 organization.
| Memory Characteristic | Specification |
|---|---|
| Capacity | 64GB |
| Rank Configuration | 2R |
| Data Organization | x4 |
| Module Organization | 2Rx4 |
| Module Organization | 8G × 72 |
| DRAM Organization | 4G × 4 |
| DRAM Packages | 40 FBGA |
The rank and organization should be considered when installing multiple DIMMs because server platforms may have specific requirements for memory-channel population.
288-Pin DDR5 DIMM
The M321R8GA0BB0-CQK uses a standard 288-pin DDR5 DIMM form factor.
However, 288-pin construction alone does not guarantee compatibility.
The target server must also support:
- DDR5 memory
- ECC memory
- Registered DIMMs
- 64GB DIMM capacity
- 2Rx4 organization
- DDR5-4800 operation
- The required memory-channel configuration
Server & Data-Center Applications
The Samsung M321R8GA0BB0-CQK is intended for compatible professional computing platforms.
Recommended applications include:
- Enterprise servers
- Data-center infrastructure
- Virtualization hosts
- Database servers
- Cloud computing
- Storage servers
- Application servers
- Network infrastructure
- High-performance computing
- Engineering workstations
- AI and compute infrastructure
- Professional applications
The exact Samsung part number is identified in server memory references and qualification documentation as a 64GB DDR5-4800 Registered ECC module with 2Rx4 organization.
Memory Population & Configuration
When installing multiple DIMMs, follow the server manufacturer’s recommended memory population sequence.
For predictable compatibility and performance, it is recommended to match:
- Capacity
- Memory technology
- Speed
- Rank
- Organization
- ECC configuration
- Registered architecture
- Manufacturer
- Part number
The exact operating speed is ultimately determined by the server platform, processor, memory controller, BIOS/firmware, and DIMM population.
Compatibility Considerations
Before purchasing or installing the M321R8GA0BB0-CQK, verify that the target system supports:
- DDR5 ECC RDIMM
- 64GB DIMMs
- DDR5-4800
- 2Rx4 memory organization
- 288-pin DDR5 DIMMs
- 1.1V DDR5 memory
- The required DIMM population configuration
This module is intended for server and professional computing platforms, not conventional desktop or laptop systems.
Important Memory Mixing Note
The M321R8GA0BB0-CQK is identified as an EC8 10×4 ECC Registered RDIMM. Some memory suppliers specifically caution against mixing EC8 RDIMMs with different ECC organizations such as EC4, ECC UDIMM, LRDIMM, or non-ECC memory.
For best results, use matching modules and follow the server manufacturer’s approved memory population guidelines.
Key Features & Benefits
- 64GB 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
- Dual-rank 2Rx4 organization
- 288-pin DDR5 DIMM
- 1.1V operating voltage
- 40 FBGA DRAM packages
- JEDEC DDR5 standard
- Designed for enterprise server platforms
- Suitable for virtualization and database workloads
- Suitable for data-center and cloud infrastructure
- Suitable for high-performance computing
- High-density single-DIMM capacity
Important Compatibility Note
The Samsung M321R8GA0BB0-CQK is a 64GB 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
- DIMM population rules
- Supported memory frequency
- Rank and organization requirements
before ordering.
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