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| Product Type | Memory Module |
|---|---|
| Compliance Standards | RoHS,WEEE |
| Memory Capacity | 64 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 | Quad Rank x4 |
| Quantity of Pins | 288-pin |
| RAM Genre | RDIMM |
Designed for server-class deployments, this 64GB DDR4-2666 RDIMM is ideally suited for virtualization platforms and in-memory databases where uptime and data integrity are critical. Its quad-rank x4 organization and registered signal architecture deliver high capacity per channel while ECC protection safeguards against single-bit errors, ensuring reliable operation in dense, multi-DIMM enterprise environments.
1. The high-density module maximizes memory per server socket, allowing expansive virtual machine deployment without sacrificing performance under heavy consolidation.
2. ECC protection silently corrects single-bit errors, safeguarding in-memory data integrity for mission-critical databases and financial transactions.
3. Registered buffering stabilizes command and address signals, ensuring reliable operation even when all memory channels are fully populated.
4. Quad Rank x4 organization interleaves memory banks to keep data paths saturated, sustaining consistent bandwidth during concurrent workload bursts.
5. The 2666 MT/s speed provides solid throughput for memory-bound analytics, reducing latency in large-scale enterprise application response.
The Samsung M386A8K40CM2-CTD7Y is a 64GB DDR4-2666 Registered DIMM built exclusively for servers, and its four characteristics directly address the real-world pressures of enterprise computing. Start with ECC error correction: in a virtualized cluster hosting dozens of VMs, a single undetected bit-flip in memory can silently corrupt a database transaction or cause a node to fail. ECC catches and corrects these errors, preserving data fidelity for financial ledgers or patient records where accuracy is non-negotiable. The Registered signal buffering then becomes critical when you populate multiple channels to reach terabytes of RAM. It stabilizes command and address lines, allowing the platform to drive a Quad Rank x4 configuration at full 2666MT/s without signal degradation—exactly what you need when running an in-memory database like SAP HANA, where every nanosecond of bandwidth counts and rank interleaving boosts parallelism. Together, these features let you consolidate heavy workloads onto fewer, denser modules, keeping server slots free for future growth while ensuring that a 24/7 operation never compromises on uptime or data integrity.
General Virtualization
For general virtualization hosts, balance capacity and memory bandwidth by populating all memory channels symmetrically. Install identical 64GB DDR4-2666 RDIMMs—typically eight modules for a dual-socket system with eight channels per CPU (1 DIMM per channel) to reach 512GB total, or six modules for a single-socket six-channel platform to achieve 384GB. This one-DIMM-per-channel (1DPC) configuration maximizes frequency headroom at 2666 MT/s while providing ample headroom for dozens of moderate VMs.
In-Memory Database
In-memory databases like SAP HANA or Redis demand maximum capacity and data integrity. Use the highest density 64GB quad-rank RDIMMs and populate two DIMMs per channel (2DPC) across all memory channels. A dual-socket server with 16 slots per CPU filled with these modules yields 2TB of ECC-protected memory. Be aware that 2DPC with quad-rank DIMMs may reduce operating speed to 2400 MT/s or 2133 MT/s—validate platform population guidelines to balance raw capacity against latency-sensitive workloads.
High-Performance Computing
HPC clusters thrive on memory bandwidth more than raw capacity per node. Install eight 64GB RDIMMs in a single-socket eight-channel platform or eight per socket in a dual-socket system, strictly at 1DPC to sustain the full 2666 MT/s speed. This delivers 512GB per node with peak bandwidth for memory-bound simulations and computational fluid dynamics. Avoid mixing DIMM ranks or populating beyond 1DPC, as quad-rank modules in a second slot often force a speed downgrade, undermining the primary HPC performance metric.
Rigorously tested server memory, compatible with Dell PowerEdge R760, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650, and more.
Q: Can I mix this M386A8K40CM2-CTD7Y with other memory modules of different brands or speeds?
A: Mixing is not recommended, even if speeds match. Differing brands, PCB revisions, or chip densities can cause signal integrity and stability issues on server platforms. Uniformity ensures reliability.
Q: Is this memory compatible with my system?
A: It is designed for servers using Intel Xeon Scalable (Skylake/Cascade Lake) or AMD EPYC processors. Verify your motherboard supports DDR4-2666 Registered ECC RDIMMs with a 288-pin interface.
Q: What is the recommended DIMM population order for optimal performance?
A: Install identical DIMMs in balanced sets across memory channels as per your server board's manual. Typically, populate the first slot on each channel (e.g., A1, B1, C1, D1) to maximize interleaving.
Q: Does this module support overclocking or XMP profiles?
A: No. This is a JEDEC-compliant enterprise RDIMM focused on data integrity and stability. XMP and overclocking are disabled because server chipsets and mission-critical workloads demand absolute reliability.
Q: What warranty and typical failure rate can I expect?
A: It includes a 1-year warranty. Server-grade ECC memory typically exhibits an Annualized Failure Rate (AFR) below 0.5%, validating its suitability for demanding 24/7 environments.