General

Engineer's Note

This RDIMM with ECC and Registered signal type is engineered for server platforms, making it ideal for virtualization, in-memory databases, and mission-critical enterprise workloads where data integrity is paramount. Its dual-rank x4 configuration combined with CL15 latency optimizes memory bandwidth and capacity density, while the 1.2V DDR4-2133 specification ensures power-efficient, reliable operation in 24/7 rack environments.

Technical Specs & Insights

1. 32GB capacity per module allows dense memory configurations essential for high virtual machine density and large in-memory databases in enterprise servers.
2. ECC error correction detects and corrects single-bit memory errors, preventing data corruption and system crashes in mission-critical server environments.
3. Registered signal type buffers address and command signals, stabilizing multi-DIMM setups and enabling higher total capacity without compromising reliability.
4. Dual Rank x4 organization interleaves memory accesses across ranks, maximizing channel utilization and sustained bandwidth for concurrent workloads.
5. CL15 column access latency provides a responsive memory subsystem, reducing transaction delays in latency-sensitive financial or database applications.

Why These Specs Matter

The M393A4K40BB0-CPB is a server-grade DDR4 Registered DIMM designed to eliminate hidden risks in data centers. Its ECC actively corrects single-bit errors, protecting in-memory databases like SAP HANA from silent corruption that could trigger financial inaccuracies. The Registered clock buffer stabilizes command signals so fully populated virtualization hosts with dozens of VMs run without signal droop—you can scale memory confidently. A dual-rank x4 organization enables bank interleaving that boosts effective bandwidth under heavy concurrent access, critical when a hypervisor must satisfy memory requests from multiple virtual machines simultaneously. Operating at a low 1.2V, it reduces thermal load and power draw, cutting cooling overhead. With a substantial 32GB capacity and CL15 latency, this RDIMM provides the density and responsiveness to expand dataset caches and keep analytical workloads flowing. It neutralizes three persistent server pain points—data corruption, signal-limited scalability, and excessive energy consumption—keeping services continuously available.

Endurance & Reliability

General Virtualization
To maximize virtual machine density, populate all memory channels with one 32GB RDIMM per channel to maintain the rated 2133MT/s speed. For a dual‑socket server with eight channels per CPU, installing sixteen identical modules yields 512GB total, balancing capacity and memory bandwidth for typical VM workloads. Avoid mixing different DIMM types to prevent performance degradation.

In-Memory Database
Low latency and large capacity are crucial. Use identical 32GB modules in every channel (1 DIMM per channel) to achieve a homogeneous memory configuration and access symmetry. A dual‑processor system with twelve populated slots, for instance, provides 384GB, enabling entire datasets to reside in RAM while sustaining ECC data integrity.

High-Performance Computing
Although 2133MT/s is modest, capacity per node is often prioritized. Equip all channels with one dual‑rank RDIMM each to preserve peak frequency and avoid down‑clocking. A typical 2‑socket server with six channels per CPU and twelve modules yields 384GB, supporting memory‑bound simulations.

Verified Compatibility

Rigorously tested; fits Dell PowerEdge R740, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650, and similar DDR4 ECC RDIMM servers.

FAQ