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| Product Type | Memory Module |
|---|---|
| Compliance Standards | |
| 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 enterprise server platforms, this 64GB DDR4-2666 Registered DIMM with ECC ensures uncompromising data integrity for virtualization, in-memory databases, and mission-critical workloads. Its Quad Rank x4 organization maximizes capacity density per channel while the registered signal type enhances signal stability across multi-DIMM configurations, and the CL19 latency delivers consistent performance under sustained heavy loads.
1. Registered signal buffering stabilizes large memory populations, enabling seamless scaling to terabyte-class configurations in mission-critical servers without compromising signal integrity.
2. ECC protection automatically detects and corrects single-bit errors, preventing silent data corruption that could destabilize financial transactions or virtualization hosts.
3. Quad Rank x4 organization maximizes per-channel capacity density, allowing deep virtual machine consolidation while sustaining balanced interleaved access patterns.
4. 64GB capacity per module empowers dense in-memory databases and massive container deployments, reducing the need for costly scale-out nodes.
5. DDR4-2666 throughput delivers sufficient memory bandwidth to keep heavily loaded CPU cores fed, maintaining predictable application latency under concurrent enterprise workloads.
In data center environments, the M386A8K40CM2-CTD7Q is an RDIMM engineered for mission-critical server workloads, where its four defining characteristics directly address the operational pain points of infrastructure managers. The module’s ECC technology is non-negotiable for data integrity: in a dense virtualization cluster running dozens of VMs, a single undetected bit flip in memory can silently corrupt guest operating systems or financial transaction logs, leading to cascading failures. The registered signal type buffers the command and address lines, enabling a single server board to support multiple 64GB quad-rank DIMMs without electrical loading that would otherwise cause instability; this scaling capacity is what allows a database node to hold entire indexed tables in memory for real-time analytics, slashing query times from seconds to microseconds. Furthermore, the DDR4-2666 speed and 1.2V operating voltage strike a deliberate balance: the 1.2V supply significantly reduces thermal output per module compared to earlier generations, which translates into lower cooling costs and higher rack density in colocation facilities. For an in-memory database such as a Redis or SAP HANA instance, the combination of quad-rank density, registered reliability, and ECC protection means that massive datasets are not just stored, but continuously served with uncompromising accuracy under 24/7 operation.
Memory Type Determination
This is a server-grade module—a 64GB DDR4-2666 Registered ECC DIMM (RDIMM) with quad-rank x4 organization, 1.2V, and CL19 latency. It is designed for enterprise servers and workstations that require data integrity and high capacity.
General Virtualization
Populate at least six to eight identical modules across all memory channels to maximize bandwidth while keeping DIMMs per channel to one or two. This avoids performance penalties from multiple ranks per channel and provides a balanced pool of 384–512 GB, comfortably hosting dozens of mixed-application VMs with ECC protection.
In-Memory Database
Deploy multiple 64GB RDIMMs to reach 512 GB or more per socket, aiming for one DIMM per channel when latency sensitivity is paramount. The large capacity allows entire datasets to reside in RAM, drastically reducing storage I/O, while registered ECC safeguards in-memory structures against bit errors during high-throughput transactions.
High-Performance Computing (HPC)
Fully populate all memory channels with one 64GB RDIMM each to sustain high memory bandwidth under heavily threaded workloads. For memory-capacity-bound simulations, install two DIMMs per channel—accepting a slight clock speed reduction—to achieve multi-terabyte footprints while retaining ECC reliability for long-running parallel jobs.
Rigorously tested server memory, validated for Dell R750, HPE DL380 Gen10, Lenovo SR650 V2.
Q: Can I mix this M386A8K40CM2-CTD7Q with other memory modules of different brands or speeds?
A: Mixing brands or speeds is not recommended for this RDIMM. For stable server operation, use identical modules with the same rank, capacity, and latency. Mixing may cause POST failures or signal integrity issues.
Q: Is this memory compatible with my system?
A: This 64GB DDR4-2666 ECC Registered DIMM is designed for server platforms using Intel Xeon Scalable or AMD EPYC processors. Please verify your motherboard’s qualified vendor list (QVL) to confirm support for quad-rank x4 RDIMMs.
Q: What is the recommended DIMM population order for optimal performance?
A: For quad-rank x4 RDIMMs, populate slots matching your server’s memory channel architecture, typically filling the farthest slot per channel first. Always consult your system board manual for the exact balanced population to maximize bandwidth.
Q: Does this module support overclocking or XMP profiles?
A: No. This is a server-grade Registered DIMM adhering to JEDEC DDR4-2666 standards. It does not support overclocking or XMP profiles, as server environments prioritize stability and data integrity over memory overclocking.
Q: What warranty and typical failure rate can I expect?
A: This module carries a one-year warranty. Server-grade ECC RDIMMs have an extremely low annualized failure rate (AFR), typically under 0.5%, thanks to rigorous screening and error correction capabilities ensuring long-term reliability.