General

Engineer's Note

This Samsung 64GB DDR4-2666 RDIMM (M393A8K40B22-CWD6Y) is engineered for enterprise servers and workloads demanding uncompromising data integrity, such as virtualization and in-memory databases, leveraging its Registered ECC design to correct single-bit errors in real time. Its Quad Rank x4 configuration maximizes memory density per channel, allowing highly scalable capacity in multi-slot systems while maintaining reliable signal integrity at 1.2V.

Technical Specs & Insights

1. ECC protection silently corrects single-bit memory errors, safeguarding financial transactions and virtualized database integrity against silent data corruption in always-on enterprise servers.
2. Registered clock buffering stabilizes command and address signals across multi-slot server boards, enabling reliable operation at high memory capacities without compromising uptime.
3. Quad Rank x4 organization interleaves multiple internal banks to saturate memory channels even with fully populated slots, sustaining throughput for heavy consolidation of virtual machines.
4. Generous module capacity allows fewer DIMMs to serve larger in-memory datasets and more resident VMs per host, directly improving consolidation ratios and data center density.
5. High clock speed strikes an optimal balance between memory bandwidth and power envelope, accelerating large-scale analytics workloads while maintaining thermal compliance in rack-dense deployments.

Why These Specs Matter

The M393A8K40B22-CWD6Y is a 64GB DDR4-2666 Registered ECC RDIMM, purpose-built to eliminate the critical pain points in modern data centers. In dense virtualization clusters, its massive capacity lets you consolidate far more VMs per server, directly cutting your hardware footprint and licensing overhead. The Registered buffer ensures rock-solid signal integrity across these high-density configurations, preventing costly boot failures when all DIMM slots are populated. For in-memory databases powering real-time analytics, ECC error correction acts as your silent guardian—it instantly catches and corrects single-bit flips that could otherwise corrupt transactional records and cause undetected financial discrepancies. Its Quad Rank x4 architecture aggressively interleaves memory banks, boosting effective bandwidth so your database queries and virtual machines never stall under heavy concurrent workloads. Finally, operating at an efficient 1.2V, this module dramatically lowers power consumption and cooling demands at scale. For your infrastructure, that translates into uncompromised data integrity, maximum workload density, and a measurably reduced total cost of ownership.

Endurance & Reliability

General Virtualization
For dense virtualization hosts, populate one 64 GB RDIMM per memory channel (1DPC) to sustain the full 2666 MT/s speed and avoid performance penalties from quad-rank downclocking. In a dual‑socket server with 12 channels, twelve modules deliver 768 GB of balanced capacity, comfortably supporting numerous VMs while preserving predictable memory bandwidth for mixed workloads.

In-Memory Database
When entire datasets must live in RAM, capacity outweighs raw frequency. Fully populate all slots, typically two DIMMs per channel (2DPC), accepting a modest speed drop to 2133 MT/s. With twenty‑four 64 GB RDIMMs, a standard dual‑socket platform reaches 1.5 TB, enabling massive in‑memory databases like SAP HANA to process transactions with minimal latency.

High-Performance Computing
HPC applications frequently demand both high bandwidth and large capacity per node. Install one quad‑rank 64 GB RDIMM per channel to lock in the native 2666 MHz data rate. A dual‑socket system with sixteen memory channels yields 1 TB of total memory, delivering the throughput critical for computational fluid dynamics, molecular modeling, or seismic processing while maintaining strict NUMA locality.

Verified Compatibility

Rigorously tested server memory, compatible with Dell PowerEdge R740, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650, and more.

FAQ