General

Engineer's Note

Optimized for dense server deployments, this 256GB DDR5-4800 registered ECC module with octal rank architecture delivers exceptional memory capacity per channel, making it ideal for virtualization farms and in-memory databases that demand uncompromising data integrity. Its 1.1V operation and registered signaling enhance signal stability under heavy multi-DIMM loads, enabling robust, energy-efficient performance at scale.

Technical Specs & Insights

1. 256GB capacity on a single stick delivers the density required to maximize terabytes per server, substantially increasing VM consolidation ratios without compromising dedicated memory per instance.
2. ECC error correction silently detects and repairs single-bit faults, eliminating silent data corruption that could otherwise jeopardize critical database transactions and financial computations.
3. Registered signaling buffers address and command lines to preserve signal integrity across heavily populated memory channels, ensuring unwavering stability in dense rack configurations.
4. DDR5-4800 with 38.4 GB/s bandwidth accelerates in-memory analytics and AI model training by feeding real-time data to hungry CPU cores without stalling under massive parallelism.
5. Octal rank design interleaves access across eight distinct bank groups, hiding precharge latency and sustaining peak throughput during the multi-tenant access storms of virtualized infrastructure.

Why These Specs Matter

The M321RBGA0B40-CWKZJ is a 256GB DDR5-4800 Registered DIMM (RDIMM), purpose-built for enterprise servers where uncompromising data integrity and massive memory density directly define uptime and performance. Its 256GB capacity on a single 288-pin module means you can provision far fewer DIMM slots while still reaching multi-terabyte footprints — critical in dense virtualization clusters where every slot saved reduces platform cost and thermal load. Built-in ECC with registered signal buffering tackles two acute pain points simultaneously: ECC silently corrects single-bit flips caused by cosmic radiation or electrical noise before they corrupt a financial transaction or a live customer record, and the register re-drives command and address lines so the memory controller stays rock-solid even under the extreme loading of 8-rank octal-rank configurations. For an in-memory database like SAP HANA or a Redis cluster powering real-time analytics, the combination of octal-rank density and DDR5’s 38.4 GB/s peak bandwidth per module eliminates swapping to disk, ensuring sub-millisecond response latencies across billions of records while the low 1.1V operating voltage drives down energy consumption at rack scale. This isn’t just a memory stick — it is an insurance policy for virtualized workloads and latency-intolerant data platforms.

Endurance & Reliability

General Virtualization
Deploying 256GB Registered DDR5 modules is ideal for dense virtualization hosts running numerous VMs. A dual-socket server can accommodate 16 or more such DIMMs, providing terabytes of capacity per node to eliminate memory contention, and ECC ensures data integrity across multi-tenant workloads.

In-Memory Database
For in-memory databases like SAP HANA or Redis, this high-capacity, octal-rank RDIMM maximizes dataset locality and throughput. Populate all memory channels symmetrically with multiple 256GB DIMMs to achieve the large, reliable footprint required, while registered buffering stabilizes signal integrity under heavy, sustained loads.

High Performance Computing (HPC)
Balance per-core memory bandwidth and capacity by equipping each CPU with a minimum of eight identical modules in a balanced configuration. The DDR5-4800 speed and CL40 latency, combined with ECC and registered architecture, deliver the deterministic, error-free performance essential for large-scale simulations and parallel computation runs.

Verified Compatibility

Rigorously tested and validated for servers: compatible with Dell PowerEdge R760, HPE ProLiant DL380 Gen11, Lenovo ThinkSystem SR650 V3.

FAQ