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| Product Type | Memory Module |
|---|---|
| Memory Capacity | 16 GB |
| Memory Technology | DDR4 |
| Product Voltage | 1.2 V |
| RAM Speed | 2666 MHz |
| RAM Standard | DDR4-2666/PC4-21300 |
| Error Identifying | ECC |
| Signal Type | Registered |
| Column Access Strobe (CAS) | CL19 |
| Rank | Single Rank x4 |
| Quantity of Pins | 288-pin |
| RAM Genre | RDIMM |
This Samsung 16GB DDR4-2666 RDIMM (PC4-21300) is a server-class memory module purpose-built for enterprise platforms running virtualization, in-memory databases, and mission-critical workloads where data integrity is non-negotiable. Its registered signal architecture and Single Rank x4 organization minimize bus loading and improve signal stability, while ECC protection reliably detects and corrects single-bit errors to maintain system uptime under heavy, sustained loads.
1. Registered signal buffering stabilizes command and address lines under heavy memory populations, enabling hyperscale servers to scale capacity without sacrificing signal integrity.
2. ECC memory continuously corrects single-bit errors, preserving data accuracy for financial databases and virtualized workloads where even silent corruption is unacceptable.
3. The module’s moderate capacity per stick maximizes total installed memory within limited server slots, letting you host more virtual machines without oversubscribing resources.
4. High DDR4 throughput keeps multi-core server processors fed with data, reducing latency spikes during concurrent analytics queries and real-time transaction processing.
5. Single-rank x4 organization lightens electrical loading on the memory channel, sustaining peak operating frequency when every DIMM slot in the server is fully utilized.
When you are running a dense virtualization cluster or an in-memory database like SAP HANA, memory errors are not just an inconvenience—they are a direct threat to data integrity and service uptime. The Samsung M393A2K40BB2-CTD6Q, a 16GB DDR4-2666 Registered ECC RDIMM, is engineered precisely for these mission-critical server environments. Its error-correcting code (ECC) silently detects and corrects single-bit data corruption, which can be caused by cosmic radiation or electrical noise, preventing silent data corruption from cascading into a failed transaction or a crashed virtual machine. This means your financial records or customer orders remain accurate, every time.
Equally important is the registered signal buffering. In a fully populated 24-DIMM server, electrical load can destabilize communication between the CPU and memory. The on-board register re-drives the signals, maintaining rock-solid stability even when all slots are filled, so you can confidently scale your virtual machine density. The single-rank x4 design further optimizes bandwidth in parallel workloads, allowing dozens of VMs to access data with consistently low latency. For a Redis or Memcached instance processing millions of requests, this translates to sustained throughput under peak loads. The 1.2V low-power operation also compounds across a data center rack: reduced thermal stress and lower energy bills without compromising the 2666MT/s performance that keeps your real-time analytics responsive.
General Virtualization
For general virtualization hosts, balance cost and density by populating one DIMM per channel to maintain full memory bandwidth while leaving room for growth. Start with six or eight 16GB RDIMMs per socket for 96GB–128GB, which comfortably supports 20–30 moderate VMs. If future scaling is anticipated, choose dual-socket platforms and initially fill only half the DIMM slots.
In-Memory Database
In-memory databases demand the highest capacity and reliability; populate all channels with 16GB RDIMMs to reach 256GB–512GB per server while maintaining ECC protection. Use the maximum number of identical 16GB modules to avoid performance penalties from mixing ranks, and configure memory mirroring or sparing if the database uptime SLA requires additional resilience.
High-Performance Computing
HPC workloads require maximum memory bandwidth, so use a balanced configuration with one or two DIMMs per channel across all memory channels. In a dual-socket node, eight to sixteen 16GB RDIMMs (128GB–256GB) allow many cores to stay fed without wasting power on overprovisioned capacity. Stick to identical registered ECC modules to ensure uniform latency and avoid NUMA imbalances.
Rigorously tested for server compatibility with Dell PowerEdge R740, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650, and more.
Q: Can I mix this M393A2K40BB2-CTD6Q with other memory modules of different brands or speeds?
A: Mixing brands or speeds is not recommended for RDIMMs. It may cause instability, POST failures, or data corruption. All modules in the same channel should be identical in rank, speed, and timings to ensure reliable operation.
Q: Is this memory compatible with my system?
A: This 16GB DDR4-2666 ECC Registered DIMM is designed for server platforms like Intel Xeon Scalable or AMD EPYC. Please verify your motherboard’s QVL and confirm support for 288-pin RDIMMs with CL19 and 1.2V.
Q: What is the recommended DIMM population order for optimal performance?
A: Populate DIMMs in each channel starting from the farthest slot from the CPU, typically in identical pairs per channel. Follow your server’s memory population guide to maximize interleaving and bandwidth, using balanced configurations for best performance.
Q: Does this module support overclocking or XMP profiles?
A: No. Server-class registered memory does not support overclocking or XMP. It operates strictly at JEDEC standard DDR4-2666 with CL19 timings, prioritizing stability, data integrity, and 24/7 reliability over performance tuning.
Q: What warranty and typical failure rate can I expect?
A: This module includes a one-year warranty. As an enterprise-grade component, it has a very low annualized failure rate (AFR), typically below 0.5%, thanks to rigorous screening and ECC error correction for reliable operation.