General

Engineer's Note

This DDR4-2133 RDIMM with ECC and registered signaling is optimized for server platforms handling virtualization, in-memory databases, and mission-critical workloads where data integrity is paramount. Its single-rank x4 configuration reduces electrical loading on the memory bus, improving signal integrity and enabling higher population density while maintaining a low CAS latency of 15 for balanced system responsiveness.

Technical Specs & Insights

1. ECC protection silently corrects single-bit errors in real time, preserving transactional integrity for databases and virtualized workloads without administrative interruption.
2. Registered buffering stabilizes signal paths across densely populated memory channels, allowing server platforms to scale to multi-terabyte capacities with predictable reliability.
3. Single Rank x4 organization concentrates memory access across fewer ranks, delivering streamlined bandwidth and reduced latency for latency-sensitive enterprise applications.
4. A sixteen-gigabyte density per module offers the ideal building block for virtual machine consolidation, maximizing guest instance density per socket while keeping memory cost-performance in balance.
5. 1.2-volt low-power operation slashes energy draw across the entire memory array, reducing cooling overhead and improving long-term total cost of ownership in hyperscale data centers.

Why These Specs Matter

The M393A2K40BB0-CPB is a 16GB DDR4-2133 Registered DIMM with ECC, purpose-built for server workloads where reliability and stability are non-negotiable. Its ECC protection continuously detects and corrects single-bit memory errors, preventing silent data corruption that could crash a virtualized cluster or poison transactions inside an in-memory database like SAP HANA. The registered buffer isolates the memory controller from electrical loading, making it possible to populate all DIMM slots with high-capacity modules without sacrificing signal integrity—a must when you need to consolidate dozens of VMs onto a single host. The single-rank x4 organization cleverly balances capacity and performance: the x4 DRAM chips provide more internal banks for superior parallelism, while the single rank reduces bus contention, delivering predictable low-latency access and the full 17 GB/s bandwidth required for real-time analytics. Finally, the 1.2 V DDR4 voltage shrinks your power footprint and thermal load, which matters greatly in densely packed virtualization clusters and 24/7 database servers where every watt counts. This module transforms raw specifications into tangible business continuity and responsive application performance.

Endurance & Reliability

General Virtualization
For a typical hypervisor hosting mixed VMs, start with four to six 16GB RDIMMs (64–96GB total) to balance VM density and cost. Distribute modules evenly across memory channels to maintain bandwidth; with DDR4-2133, latency-sensitive workloads benefit from CL15. Scale by adding identical single-rank modules in matched sets to avoid performance penalties from mixed ranks.

In-Memory Database
In-memory platforms like Redis or SAP HANA demand capacity and reliability above all. Populate all available channels with 16GB RDIMMs — typically twelve or sixteen modules for 192–256GB — using single-rank x4 DIMMs to ensure low latency and ECC protection against bit errors. Configure sparing and mirroring modes only if absolute data integrity is required, sacrificing usable capacity.

High-Performance Computing
HPC clusters prioritize memory bandwidth over raw capacity per node. Install eight 16GB RDIMMs (128GB) in a balanced eight-channel configuration to saturate the memory controller. The registered ECC design at 1.2V keeps power per module low, critical for dense racks. Single-rank modules at 2133MT/s provide predictable timings under sustained parallel I/O, reducing variability in tightly coupled MPI jobs.

Verified Compatibility

Rigorously tested server memory; compatible with Dell PowerEdge R730, HPE ProLiant DL380 Gen9, Lenovo ThinkSystem SR650.

FAQ