Samsung M321R8GA0BB0-CQK 64G DDR5 4800 RDIMM
The Samsung M321R8GA0BB0-CQK is a 64GB DDR5-4800 registered ECC DIMM built for enterprise servers, virtualization hosts, and cloud computing platforms that run 24/7. As an RDIMM, it offloads address/command driving to a register, allowing higher memory populations per channel than UDIMMs — a practical fit for dense virtualization and cache-tier workloads. Note that DDR5 RDIMMs are not backward compatible with DDR4 platforms, so confirm your motherboard and CPU (typically Intel Xeon Scalable or AMD EPYC with DDR5 support) before ordering.
Key specifications (table)
| Parameter | Specification |
|---|---|
| Brand | Samsung |
| Part Number | M321R8GA0BB0-CQK |
| Memory Type | DDR5 ECC Registered DIMM (RDIMM) — not interchangeable with DDR4 modules |
| Capacity | 64GB |
| Speed | DDR5-4800 / PC5-38400 |
| Data Transfer Rate | 4800 MT/s (actual rate may be limited by CPU/memory controller support) |
| Rank Configuration | 2Rx4 (dual rank) |
| ECC Support | Yes — on-die ECC plus registered parity, suited to data-integrity-critical workloads |
| Operating Voltage | 1.1V (lower than DDR4’s typical 1.2V) |
| Pin Count | 288-pin |
| Module Type | RDIMM |
| Chip Organization | (4G × 4) × 20 |
| CAS Latency | CL40 |
| Application | Enterprise servers, cloud computing, virtualization platforms, data centers |
| Operating Environment | 24/7 enterprise-class operation |
| Product Status | Enterprise-class mass production |
Good to know
- Compatibility: 288-pin DDR5 RDIMMs install only in DDR5 registered-dimm slots; they cannot be mixed with DDR4 or with consumer-grade UDIMMs/SODIMMs. Verify your platform’s validated memory list (QVL) and whether it supports the 4800 MT/s speed tier — slower-speed population rules may apply when filling multiple DIMMs per channel.
- Within Samsung’s DDR5 RDIMM family, this dual-rank (2Rx4) 64GB module balances capacity and channel population flexibility, making it a common choice for virtualization hosts where aggregate bandwidth and per-channel DIMM count both matter.
- Buying tip: order modules of identical part number, rank, and speed for each server to avoid mixed-population instability, and confirm whether your deployment requires matched kits from the same production batch.
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 M321R8GA0BB0-CQK is a 64GB DDR5-4800 registered ECC DIMM built for enterprise servers, virtualization hosts, and cloud computing platforms that run 24/7. As an RDIMM, it offloads address/command driving to a register, allowing higher memory populations per channel than UDIMMs — a practical fit for dense virtualization and cache-tier workloads. Note that DDR5 RDIMMs are not backward compatible with DDR4 platforms, so confirm your motherboard and CPU (typically Intel Xeon Scalable or AMD EPYC with DDR5 support) before ordering.
Key specifications (table)
| Parameter | Specification |
|---|---|
| Brand | Samsung |
| Part Number | M321R8GA0BB0-CQK |
| Memory Type | DDR5 ECC Registered DIMM (RDIMM) — not interchangeable with DDR4 modules |
| Capacity | 64GB |
| Speed | DDR5-4800 / PC5-38400 |
| Data Transfer Rate | 4800 MT/s (actual rate may be limited by CPU/memory controller support) |
| Rank Configuration | 2Rx4 (dual rank) |
| ECC Support | Yes — on-die ECC plus registered parity, suited to data-integrity-critical workloads |
| Operating Voltage | 1.1V (lower than DDR4’s typical 1.2V) |
| Pin Count | 288-pin |
| Module Type | RDIMM |
| Chip Organization | (4G × 4) × 20 |
| CAS Latency | CL40 |
| Application | Enterprise servers, cloud computing, virtualization platforms, data centers |
| Operating Environment | 24/7 enterprise-class operation |
| Product Status | Enterprise-class mass production |
Good to know
- Compatibility: 288-pin DDR5 RDIMMs install only in DDR5 registered-dimm slots; they cannot be mixed with DDR4 or with consumer-grade UDIMMs/SODIMMs. Verify your platform’s validated memory list (QVL) and whether it supports the 4800 MT/s speed tier — slower-speed population rules may apply when filling multiple DIMMs per channel.
- Within Samsung’s DDR5 RDIMM family, this dual-rank (2Rx4) 64GB module balances capacity and channel population flexibility, making it a common choice for virtualization hosts where aggregate bandwidth and per-channel DIMM count both matter.
- Buying tip: order modules of identical part number, rank, and speed for each server to avoid mixed-population instability, and confirm whether your deployment requires matched kits from the same production batch.
For tray and reel pricing, current stock by part number and date code, and volume discounts on bulk orders, request a bulk quotation.
