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| Product Type | Memory Module |
|---|---|
| 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 and quad-rank x4 configuration delivers exceptional memory density per channel, making it ideal for heavily virtualized environments and in-memory databases. Its registered signal architecture and ECC ensure rock-solid data integrity under continuous high-load operation, while the CL19 latency provides a pragmatic balance between response time and stable 1.2V power efficiency in multi-slot populated servers.
1. Large module capacity enables high-density server configurations, allowing seamless scaling of virtualized environments and in-memory databases without sacrificing performance.
2. ECC protection silently corrects single-bit errors, crucial for maintaining data integrity in financial services and mission-critical enterprise workloads.
3. Registered buffer isolates the memory controller from electrical load, ensuring rock-solid signal stability across dozens of DIMMs in a fully populated server.
4. Quad Rank x4 organization packs maximum memory into each channel, ideal for maximizing VM density and large dataset processing under heavy consolidation.
5. Optimized 2666 MT/s throughput balances bandwidth and latency, efficiently feeding multi-core server processors during sustained computational loads.
Based on its RDIMM classification, registered signal type, and ECC, the M386A8K40CM2-CTD is unequivocally a server-grade memory module. Its four defining characteristics directly address the non-negotiable demands of enterprise data centers, where failure is not an option.
The ECC technology guards against silent data corruption caused by cosmic ray-induced bit flips. In an in-memory database like SAP HANA, a single uncorrected error could cascade into financial miscalculations or transaction rollbacks; this module intercepts such errors in real time, safeguarding data integrity at the transistor level. Meanwhile, the registered architecture buffers command signals, relieving the electrical load on the CPU’s integrated memory controller. This becomes critical in dense virtualization clusters running dozens of VMs per node, allowing you to populate all 24 DIMM slots without sacrificing signal stability or risking boot failures.
The quad-rank x4 configuration maximizes capacity per channel while leveraging rank interleaving to amplify sustained bandwidth. For a hypervisor stack juggling simultaneous live migrations, this translates to markedly higher IOPS and smoother responsiveness under contention. The DDR4-2666 speed at a mere 1.2V delivers that throughput within a tight thermal envelope, reducing cooling opex in a packed 2U rack. This isn’t just memory; for your virtualized workload or real-time analytics platform, it is a deliberate insurance policy against downtime and a foundation for predictable, line-rate performance.
General Virtualization
For hypervisor hosts running multiple VMs, balance capacity and memory bandwidth by populating all memory channels per socket symmetrically. Using these 64GB quad-rank RDIMMs, a dual-socket server with 8 channels per CPU benefits from 16 identical modules (1TB total); this configuration supports high VM density while maintaining a consistent NUMA topology and reliable ECC protection.
In-Memory Database
In-memory databases demand maximum capacity and uncompromised data integrity. Fully populate a multi-socket platform—for example, 24 modules in a 2-socket server with 12 memory channels—to achieve 1.5TB. Be aware that quad-rank DIMMs in a fully loaded system may require reducing memory speed to 2400 MT/s; adhere to the vendor’s population rules to ensure stability for large SAP HANA or Redis datasets.
High Performance Computing
For bandwidth-sensitive HPC simulations, prioritise one DIMM per channel (1DPC) to sustain the full 2666 MT/s speed. A typical dual-socket server with 8 channels per socket uses 16 modules, delivering 1TB with peak throughput. If the workload leans toward capacity-driven modelling, a balanced 2DPC layout is acceptable, but expect a moderate downclock; always validate against the platform’s memory guide to prevent performance degradation.
Rigorously tested server memory compatible with Dell PowerEdge R760, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650, and similar systems.
Q: Can I mix this M386A8K40CM2-CTD with other memory modules of different brands or speeds?
A: Mixing different brands or speeds with this 64GB DDR4-2666 ECC Registered RDIMM is not recommended. It can lead to instability or failure to POST. For guaranteed reliability, always pair identical modules with matching rank, CAS latency, and voltage.
Q: Is this memory compatible with my system?
A: This module is designed for server platforms supporting DDR4-2666 ECC Registered memory, such as Intel Xeon Scalable or AMD EPYC systems. Verify that your server board or hardware compatibility list explicitly supports 64GB 4Rx4 RDIMMs with CL19.
Q: What is the recommended DIMM population order for optimal performance?
A: Follow your server motherboard's population guide. Typically, install this Quad Rank module in the first slot of each memory channel first, then populate the second slot. Balancing channels maximizes bandwidth and avoids performance penalties from mixing ranks within a channel.
Q: Does this module support overclocking or XMP profiles?
A: No, this enterprise-grade memory operates strictly at JEDEC standard DDR4-2666 with no XMP or overclocking support. It is engineered for unwavering stability and data integrity in mission-critical environments, not for performance tuning.
Q: What warranty and typical failure rate can I expect?
A: This module carries a 1-year warranty. As a high-quality ECC RDIMM, it exhibits an extremely low annualized failure rate (AFR) typically below 0.5%, ensuring dependable long-term operation in properly cooled and managed server environments.