General

Engineer's Note

Designed for enterprise servers, this 128GB DDR4-3200 registered ECC RDIMM with a quad-rank x4 organization delivers massive capacity and strong signal integrity for memory-intensive workloads like virtualization and in-memory databases. Its ECC error correction and 22-cycle CAS latency ensure dependable data integrity and consistent performance under sustained heavy load.

Technical Specs & Insights

1. 128GB capacity per module enables dense memory footprints, allowing IT architects to maximize virtual machine consolidation on a single physical host without sacrificing performance.
2. DDR4-3200 speed supplies the high throughput needed to keep pace with modern multi-core server CPUs, reducing data starvation in analytics and AI inference pipelines.
3. ECC error correction continuously detects and repairs single-bit memory faults in real time, preserving strict data integrity for financial transactions and critical databases.
4. Registered signal type buffers command and address paths, ensuring clean signal integrity when scaling to large-capacity memory configurations across multiple DIMM slots.
5. Quad Rank x4 organization multiplies bank-level parallelism within each channel, sustaining heavily loaded memory bandwidth ideal for virtualization and containerized workloads.

Why These Specs Matter

The Samsung M386AAG40AM3-CWELG is a 128GB DDR4-3200 Registered ECC memory module engineered for enterprise servers where data integrity and unwavering stability define successful operations. In a dense virtualization cluster, its Registered architecture buffers command and address signals, dramatically lowering the electrical load on the memory controller. For you, this means confidently populating all DIMM slots to run dozens of virtual machines without the signal degradation that causes host crashes and cascading service outages. The integrated ECC transparently corrects single-bit errors — cosmic-ray-induced bit flips that would otherwise corrupt a financial transaction or silently skew a scientific model. This error correction directly safeguards the accuracy of your mission-critical workloads. The massive 128GB density, delivered through a Quad Rank x4 design, provides the capacity headroom to hold entire in-memory databases like Redis or SAP HANA in DRAM. You eliminate disk bottlenecks and accelerate real-time analytics because every query hits memory. Backed by a swift 3200MT/s transfer rate and a stable CL22 latency, the module feeds data to multi-core CPUs fast enough to maintain responsiveness across concurrent virtualized applications, translating dense capacity into uncompromising throughput and uptime.

Endurance & Reliability

Capacity Planning for 128GB DDR4-3200 RDIMM

This registered ECC module is designed for servers and high-end workstations. Its quad-rank, x4 organization and 128GB density make it ideal for memory-bound workloads where maximizing capacity per channel is essential. Below are recommendations for typical server scenarios.

General Virtualization
Populate two or four modules per CPU to deliver 256 GB to 512 GB, which is a sweet spot for mixed VMs without over-allocating idle memory. Use a balanced DIMM-per-channel configuration—one DIMM per channel maintains the full 3200 MT/s speed, while two DIMMs per channel can double capacity to 1 TB but may drop the speed to 2933 MT/s. For most hypervisors, the capacity gain outweighs the slight frequency reduction.

In-Memory Database
Low latency and high bandwidth are critical. Install one module per memory channel to preserve the rated 3200 MT/s and CL22 timing, achieving 768 GB on a 6-channel platform or 1 TB on an 8-channel server. Enable memory interleaving and, if available, use persistent memory mirroring to safeguard datasets. Avoid populating two DIMMs per channel, as the speed penalty can impact transaction throughput.

High-Performance Computing
Capacity-per-node is often secondary to sustained bandwidth. Deploy six or eight modules (768 GB / 1 TB) with one DIMM per channel to keep the 3200 MT/s frequency. The quad-rank design provides rank interleaving, which helps hide DRAM precharge delays during dense linear algebra operations. Pair this memory with CPUs that have high memory bandwidth ratings to prevent bottlenecks in parallel workloads.

Verified Compatibility

Strictly validated server memory. Works with Dell PowerEdge R750, HPE ProLiant DL380 Gen10 Plus, Lenovo ThinkSystem SR650 V2.

FAQ