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| Product Type | Memory Module |
|---|---|
| Memory Capacity | 256 GB |
| Memory Technology | DDR5 |
| Product Voltage | 1.1V |
| RAM Speed | 4800MHz |
| RAM Standard | DDR5-4800/PC5-38400 |
| Error Identifying | ECC |
| Signal Type | Registered |
| Column Access Strobe (CAS) | CL4 |
| Rank | Octal Rank x4 |
| Quantity of Pins | 288-pin |
| RAM Genre | RDIMM |
This DDR5-4800 Registered ECC RDIMM is tailored for dual-socket enterprise servers and high-density computing platforms, excelling in memory-intensive workloads such as virtualization, large-scale in-memory databases, and real-time analytics. Its Octal Rank x4 organization maximizes per-channel capacity and bank-level parallelism, while the ultra-low CL4 column access latency and registered signal buffering deliver exceptional data integrity and reduced command bus loading under heavy load.
1. A single module delivering massive capacity lets a server fully populate memory channels with far fewer DIMMs, drastically increasing virtual machine density for large-scale cloud and enterprise consolidation.
2. The newest server memory standard provides higher bank counts and on‑die ECC, boosting both throughput and reliability per watt to meet sustainability targets in always‑on data centers.
3. Elevated interface speed feeds modern multi‑core processors with the bandwidth necessary for real‑time analytics, large in‑memory databases, and latency‑sensitive transactional systems.
4. Hardware error correction silently detects and repairs single‑bit flips, preserving data integrity across weeks‑long simulation runs and mission‑critical financial processing without application interruption.
5. On‑module signal buffering keeps command and address lines clean under fully loaded octal‑rank configurations, maintaining stable operation at maximum capacity in dense rack deployments.
The M321RBGA0B40-CWKBH is a server-grade DDR5 RDIMM built for demanding enterprise workloads. Its massive 256GB capacity and octal-rank x4 architecture fuel virtualized clusters and in-memory databases alike. For consolidation, ECC is critical—it eliminates single-bit errors that can silently corrupt hypervisor states or transactional data, ensuring 24/7 integrity. The registered clock driver buffers all eight ranks, isolating the CPU from electrical noise and enabling fully populated server configurations without signal degradation. That octal-rank design also keeps throughput high by interleaving requests across multiple banks, which is exactly what an in-memory database like SAP HANA needs to turn terabytes of data into real-time insights. With an unprecedented CAS latency of just 4 cycles, hot data access is nearly instantaneous, shrinking query response times. Operating at a low 1.1V, the module dramatically reduces power consumption and cooling costs across a data center. This is engineered reliability for the moments when every transaction and every virtual machine must perform flawlessly.
General Virtualization
For dense server virtualization, this 256GB DDR5-4800 RDIMM is ideal. A dual-socket system can be populated with one module per memory channel (e.g., 16 modules across 16 channels) to reach 4TB total, providing ample capacity for hundreds of VMs without swapping. Balanced frequency and high capacity ensure stable overcommit levels while keeping power consumption at a low 1.1V.
In-Memory Database
In-memory databases like SAP HANA or Redis demand maximum capacity and data integrity. Deploy multiple 256GB modules to fully populate all memory channels—often 16 or 32 slots—achieving 4TB or 8TB per node. The ECC and registered design guarantee reliability for mission-critical transactional workloads, and the octal-rank x4 organization delivers the high bank count needed for sustained random access performance.
High-Performance Computing (HPC)
For memory-bandwidth-sensitive HPC workloads, install eight or sixteen modules per node to enable full interleaving and maximize DDR5-4800 throughput. The 256GB capacity per DIMM allows large working sets (e.g., weather simulations, CFD models) to reside entirely in memory. Registered ECC protects against soft errors during long-running parallel jobs, while 1.1V operation helps control thermal output in dense cluster configurations.
Rigorously tested for server compatibility: Dell PowerEdge R760, HPE ProLiant DL380 Gen11, Lenovo ThinkSystem SR650 V3.
Q: Can I mix this M321RBGA0B40-CWKBH with other memory modules of different brands or speeds?
A: Mixing is not recommended. This 256GB DDR5-4800 RDIMM uses a specific Octal Rank x4 architecture. Combining with different ranks, speeds, or vendors may cause signal integrity issues and POST failures.
Q: Is this memory compatible with my system? Which Intel or AMD platforms support it?
A: It is designed for server platforms supporting DDR5-4800 Registered ECC memory. Compatible with 4th Gen Intel Xeon Scalable (Sapphire Rapids) and AMD EPYC 9004 Series processors. Verify motherboard support for 256GB Octal Rank x4 RDIMMs.
Q: What is the recommended DIMM population order for optimal performance?
A: Populate one DIMM per channel first, balancing across all memory controllers. For dual-processor systems, install identical modules into corresponding slots on each CPU riser. Refer to your server vendor’s population guide to avoid performance degradation.
Q: Does this module support overclocking or XMP profiles?
A: No. This is an enterprise-grade Registered ECC DIMM adhering to JEDEC DDR5-4800 standards. It does not support overclocking or XMP profiles, as stability and data integrity are paramount in server environments.
Q: What warranty and typical failure rate can I expect?
A: This module carries a one-year warranty. As an enterprise product built with premium DRAM, the typical Annualized Failure Rate is exceptionally low, generally under 0.5%. Exact figures depend on operating conditions and system cooling.