General

Engineer's Note

This 128GB DDR4-2400 Registered ECC module, built with an octal-rank x4 organization, is engineered purely for enterprise servers and is ideally suited for memory-bound workloads like large-scale virtualization, in-memory databases, and consolidated data analytics where data integrity cannot be compromised. Its registered signal architecture ensures stable operation under heavy load-per-channel configurations, while integrated ECC corrects single-bit errors and detects multi-bit faults, safeguarding mission-critical operations in platforms such as tier-1 hypervisors and database clusters.

Technical Specs & Insights

1. Triple-digit gigabyte density per module condenses vast memory pools into a few slots, enabling a single rack to host massive in-memory databases without sacrificing performance headroom.
2. The Octal Rank x4 organization maximizes bank interleaving, giving virtual machines under heavy consolidation consistent low-latency access to memory and preventing throughput collapse during spikes.
3. Registered clocking with a dedicated buffer stabilizes signal paths across fully loaded memory channels, a foundational reliability pillar for always-on cloud infrastructure.
4. ECC protection corrects transient bit flips on the fly, so mission-critical applications like real-time fraud detection run uncorrupted through years of continuous operation.
5. DDR4-2400 transfer rate sustains 19.2 GB/s per channel, balancing raw bandwidth with thermal efficiency to keep clustered hypervisors responsive without driving up cooling costs.

Why These Specs Matter

When you are running a virtualized cluster hosting dozens of mission-critical VMs, or powering an in-memory database where every transaction must be instantly committed, memory integrity and performance are non-negotiable. The Samsung M386AAK40B40-CUC4Q is a 128GB DDR4-2400 Registered ECC RDIMM engineered precisely for these enterprise demands. Its ECC technology actively corrects single-bit errors caused by background radiation, preventing silent data corruption that could crash a hypervisor or poison financial records. The registered buffer stabilizes signal distribution across densely populated server boards, so even fully loaded with multiple modules, your system boots reliably and operates without intermittent glitch. With an Octal Rank x4 organization, this module delivers massive bank-level parallelism, dramatically improving throughput when dozens of virtual machines contend for memory access or when a Redis cluster processes millions of concurrent keys. The 128GB single-stick density allows scaling to terabytes of RAM without sacrificing precious DIMM slots, essential for software-defined storage or large-scale SAP HANA instances. In a virtualized data center or real-time analytics platform, this memory translates directly into unshakeable uptime, predictive query performance, and efficient infrastructure consolidation.

Endurance & Reliability

This 128GB DDR4-2400 ECC Registered RDIMM (PC4-19200, CL17, Octal Rank x4) is a high-density server memory module designed for platforms that demand massive capacity, data integrity, and stable registered signaling. Capacity planning revolves around populating memory channels to balance bandwidth and capacity per workload.

General Virtualization
For a dual-socket server hosting dozens of VMs, install at least eight of these modules (1TB total) evenly across all memory channels—typically one 128GB DIMM per channel. This setup provides maximum capacity while still leveraging all memory channels for good bandwidth. Scale to 16 modules (2TB) if VM density and memory overcommitment demand extra headroom.

In-Memory Database
In-memory databases like SAP HANA or Redis require large, low-latency memory pools. Fully populate each memory channel with one 128GB RDIMM per channel for balanced bandwidth, or use two DIMMs per channel if the platform supports LRDIMM-like operation for higher capacity. A four-socket server with 48 slots can reach 6TB using these 128GB modules, ideal for real-time analytics.

High-Performance Computing (HPC)
HPC workloads favor memory bandwidth alongside capacity. Use one 128GB RDIMM per channel to maintain high clock speeds and avoid performance drops from multiple DIMMs per channel. For fat nodes running memory-bound simulations, populate all channels to reach 1-2TB per node. Pair with fewer, higher-speed CPUs if the 2400MT/s speed becomes a bottleneck for extremely bandwidth-sensitive codes.

Verified Compatibility

Rigorously tested server memory. Compatible with Dell PowerEdge R760, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650, and more.

FAQ