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| Product Type | Memory Module |
|---|---|
| Compliance Standards | |
| 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 | Dual Rank x4 |
| Quantity of Pins | 288-pin |
| RAM Genre | RDIMM |
This Samsung 16GB DDR4-2666 RDIMM (M393A2G40EB2-CTD) is engineered specifically for enterprise server platforms, where its Registered ECC architecture ensures rock-solid data integrity for virtualization clusters and in-memory databases under sustained load. The dual-rank x4 organization with CL19 timing leverages interleaving to boost bandwidth efficiency, making it an optimal choice for memory-intensive workloads that demand both reliability and throughput.
1. ECC error correction detects and corrects single-bit memory faults in real time, a non-negotiable safeguard for transactional databases and financial workloads where data integrity is paramount.
2. Registered signal type buffers the command and address lines, slashing electrical load on the memory controller so large server farms can run fully populated 24-slot boards without signal degradation.
3. 16 GB capacity per stick gives a dual-socket box ample headroom to host more virtual machines per node, directly cutting software licensing costs and rack-space overhead.
4. Dual Rank x4 organization interleaves internal banks to keep the 72-bit channel busy, sustaining near-peak throughput during heavy consolidation of mixed enterprise workloads.
5. DDR4-2666 speed delivers a reliable 21.3 GB/s of bandwidth per channel, matching the sweet spot where typical virtualized environments get responsive I/O without pushing power envelopes.
When your business relies on virtualized clusters and in‑memory databases, every clock cycle counts and every bit must be trusted. The Samsung M393A2G40EB2‑CTD 16GB DDR4‑2666 RDIMM answers these demands with four decisive traits. ECC actively corrects silent single‑bit flips—in a trading application, a flipped bit can distort a transaction value instantly, creating a compliance nightmare that only hardware‑level correction can prevent. Its Registered buffer then lets you fully populate high‑density server nodes without signal collapse, eliminating the intermittent crashes that break strict SLAs. The Dual Rank x4 organization doubles bank‑level parallelism, meaning an in‑memory database like Redis handles thousands of concurrent queries with markedly lower latency because data is prefetched across ranks in parallel. Finally, the 1.2V operating voltage and 2666MT/s speed sustain that throughput while driving down cooling costs in dense colocation racks. For your operation, it is not merely memory—it is an insurance policy for data integrity and application uptime in the real world.
Capacity Planning for DDR4-2666 ECC RDIMM (16GB Modules)
This DDR4-2666 ECC Registered DIMM is a server-class memory module. With error correction and buffering, it is designed for stability under sustained workloads in rack-mount servers and workstations. Below are capacity guidelines for typical server scenarios.
General Virtualization
For a virtualization host running 10–20 light to moderate VMs, populate at least six 16GB modules (96GB total) across all memory channels to balance capacity and bandwidth. Distribute modules evenly per CPU socket to leverage full interleaving and avoid NUMA bottlenecks. For larger consolidation ratios, scale to 128GB using eight modules.
In-Memory Database
In-memory databases like Redis or SAP HANA demand low latency and high reliability. Deploy twelve 16GB modules (192GB) across a dual-socket server to keep the working set entirely in RAM while maintaining dual-rank performance per channel. ECC is essential here to prevent silent data corruption, but ensure total capacity includes headroom for replication and persistence overhead.
High-Performance Computing
HPC jobs thrive on memory bandwidth. Install one dual-rank x4 16GB RDIMM per channel in an eight-channel system (128GB) to saturate bandwidth without exceeding the optimal 2 DIMMs-per-channel limit. For memory-bound simulations, scale up by populating a second identical module per channel, keeping populations symmetric across all slots to preserve balanced access times.
Rigorously tested, compatible with Dell PowerEdge R760, HPE ProLiant DL380 Gen10, and Lenovo ThinkSystem SR650.
Q: Can I mix this M393A2G40EB2-CTD with other memory modules of different brands or speeds?
A: Mixing is not recommended for server environments. Mismatched modules may cause instability and disable ECC protection. Always populate identical Samsung RDIMMs to ensure validated reliability and consistent performance.
Q: Is this memory compatible with my system?
A: This 16GB DDR4-2666 Registered ECC RDIMM is designed for servers using Intel Xeon E5-2600 v3/v4, Scalable, or AMD EPYC platforms with 288-pin slots. Verify your board supports RDIMM, not UDIMM.
Q: What is the recommended DIMM population order for optimal performance?
A: Follow your server motherboard manual. Typically, populate identical DIMMs per channel starting from the farthest slot from the CPU. Balanced population across all memory channels maximizes bandwidth.
Q: Does this module support overclocking or XMP profiles?
A: No. As an enterprise server RDIMM, it operates strictly at JEDEC standard DDR4-2666 (PC4-21300) with CL19. Overclocking and XMP are not supported to guarantee data integrity and 24/7 stability.
Q: What warranty and typical failure rate can I expect?
A: This Samsung module includes a 1-year warranty. It is built with high-quality components, delivering an extremely low annualized failure rate (AFR) typical of tier-one server memory, ensuring long-term reliability.