Samsung M321RBGA0B40-CWK 256G DDR5 4800 RDIMM
The Samsung M321RBGA0B40-CWK is a 256GB DDR5-4800 registered ECC DIMM built for high-performance enterprise servers, cloud platforms, and data-intensive workloads such as big data analytics and AI training. Its 4Rx4 high-density configuration makes it well suited to memory-hungry virtualization hosts and cache-tier deployments where large per-socket capacity matters. Note that as a registered DDR5 module it is only compatible with platforms that explicitly support DDR5 RDIMMs — it cannot be mixed with DDR4 RDIMMs or used in desktop UDIMM slots.
Key specifications (table)
| Parameter | Specification |
|---|---|
| Brand | Samsung |
| Part Number | M321RBGA0B40-CWK |
| Memory Type | DDR5 ECC Registered DIMM (RDIMM) |
| Capacity | 256GB |
| Speed | DDR5-4800 / PC5-38400 (final speed may depend on platform and population) |
| Data Transfer Rate | 4800 MT/s |
| Rank Configuration | 4Rx4 (quad-rank, high-density layout) |
| ECC Support | Yes (registered ECC, for server platforms only) |
| Operating Voltage | 1.1V (lower than DDR4’s typical 1.2V) |
| Pin Count | 288-pin |
| Module Type | RDIMM |
| Chip Organization | High-Density DDR5 DRAM Components |
| CAS Latency | CL40 |
| Application | High-Performance Enterprise Servers, Cloud Computing, Big Data Analytics, AI Training, Data Centers |
| Operating Environment | 24/7 Enterprise-Class Operation |
| Product Status | Enterprise-Class Mass Production |
Good to know
- Compatibility: DDR5 RDIMMs are electrically and physically different from DDR4 RDIMMs and from DDR5 UDIMMs/LRDIMMs — verify your server platform’s qualified memory list (QVL) and support for quad-rank 256GB modules before ordering, and follow the vendor’s channel population guidance to achieve rated speed.
- Within Samsung’s DDR5 RDIMM family, this quad-rank 4Rx4 module maximizes capacity per slot, making it the right choice when you need to fill fewer DIMM slots with more memory, at the cost of the higher speed grades typically seen on lower-rank modules.
- Buying tip: for multi-CPU virtualization or cache-tier hosts, purchase modules in matched sets (identical part number and rank configuration) to keep memory channel balance symmetrical across sockets.
For tray and reel pricing, current stock by part number and date code, and volume discounts on bulk orders, request a bulk quotation.
The Samsung M321RBGA0B40-CWK is a 256GB DDR5-4800 registered ECC DIMM built for high-performance enterprise servers, cloud platforms, and data-intensive workloads such as big data analytics and AI training. Its 4Rx4 high-density configuration makes it well suited to memory-hungry virtualization hosts and cache-tier deployments where large per-socket capacity matters. Note that as a registered DDR5 module it is only compatible with platforms that explicitly support DDR5 RDIMMs — it cannot be mixed with DDR4 RDIMMs or used in desktop UDIMM slots.
Key specifications (table)
| Parameter | Specification |
|---|---|
| Brand | Samsung |
| Part Number | M321RBGA0B40-CWK |
| Memory Type | DDR5 ECC Registered DIMM (RDIMM) |
| Capacity | 256GB |
| Speed | DDR5-4800 / PC5-38400 (final speed may depend on platform and population) |
| Data Transfer Rate | 4800 MT/s |
| Rank Configuration | 4Rx4 (quad-rank, high-density layout) |
| ECC Support | Yes (registered ECC, for server platforms only) |
| Operating Voltage | 1.1V (lower than DDR4’s typical 1.2V) |
| Pin Count | 288-pin |
| Module Type | RDIMM |
| Chip Organization | High-Density DDR5 DRAM Components |
| CAS Latency | CL40 |
| Application | High-Performance Enterprise Servers, Cloud Computing, Big Data Analytics, AI Training, Data Centers |
| Operating Environment | 24/7 Enterprise-Class Operation |
| Product Status | Enterprise-Class Mass Production |
Good to know
- Compatibility: DDR5 RDIMMs are electrically and physically different from DDR4 RDIMMs and from DDR5 UDIMMs/LRDIMMs — verify your server platform’s qualified memory list (QVL) and support for quad-rank 256GB modules before ordering, and follow the vendor’s channel population guidance to achieve rated speed.
- Within Samsung’s DDR5 RDIMM family, this quad-rank 4Rx4 module maximizes capacity per slot, making it the right choice when you need to fill fewer DIMM slots with more memory, at the cost of the higher speed grades typically seen on lower-rank modules.
- Buying tip: for multi-CPU virtualization or cache-tier hosts, purchase modules in matched sets (identical part number and rank configuration) to keep memory channel balance symmetrical across sockets.
For tray and reel pricing, current stock by part number and date code, and volume discounts on bulk orders, request a bulk quotation.
