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| Product Type | Memory Module |
|---|---|
| Compliance Standards | |
| Memory Capacity | 128 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 | Octal Rank x4 |
| Quantity of Pins | 288-pin |
| RAM Genre | RDIMM |
Designed for servers, this 128GB DDR4-2666 RDIMM with ECC and registered signaling delivers the data integrity and signal stability essential for virtualization, in-memory databases, and mission-critical enterprise workloads. Its octal-rank x4 configuration maximizes module density while maintaining manageable electrical loading on the memory controller, ensuring reliable operation in high-capacity multi-DIMM platforms.
1. 128GB capacity enables heavy virtual machine consolidation on a single server node, directly reducing hardware footprint and operational costs in large-scale data centers.
2. ECC protection silently detects and corrects single-bit memory errors, preserving data integrity for mission-critical financial transactions and long-running scientific computations.
3. Registered signal architecture buffers command and address lines, allowing multiple high-capacity DIMMs to operate stably in dense server configurations without signal degradation.
4. Octal Rank x4 organization multiplies bank groups accessible in parallel, sustaining high throughput under mixed workloads typical of enterprise cloud and database platforms.
5. DDR4-2666 speed supplies 21.3 GB/s peak bandwidth per channel, accelerating in-memory analytics and ensuring responsiveness for latency-sensitive virtualized services.
The M386AAK40B40-CWD6Y is a server-grade DDR4-2666 Registered DIMM (RDIMM) engineered for mission-critical enterprise workloads, and its four standout features directly address the real pain points of data center operators. First, the 128 GB capacity built with Octal Rank x4 architecture means you can pack massive memory footprints into fewer slots—critical for dense virtualization clusters where maximizing VM density per host directly lowers licensing and footprint costs. Second, the registered signal buffer uses an onboard clock driver to stabilize the command bus, enabling systems to reliably populate all channels with high-capacity modules without timing failures that would otherwise crash an entire hypervisor. Third, integrated ECC continuously corrects single-bit errors and detects multi-bit corruption; in an in-memory database scenario like SAP HANA or Redis, this integrity layer prevents silent data corruption that could flip a financial transaction or corrupt a customer record without any warning. Finally, the 2666 MT/s speed and CL19 latency, combined with the deep interleaving of eight ranks, sustain high bandwidth under concurrent access from dozens of virtual machines, ensuring that your analytics queries and transactional commits never stall waiting for memory fetches. Together, these translate directly into fewer outages, safer data, and higher server utilization for your infrastructure.
General Virtualization
Deploy this 128GB RDIMM in a dual-socket server to achieve 256GB total capacity per node, comfortably hosting 40-50 moderate VMs. Populate eight identical modules per CPU to maintain balanced memory channels and maximize throughput for mixed workloads. ECC and register buffering ensure data integrity and signal stability under sustained multi-tenant pressure.
In-Memory Database
Accelerate Redis, SAP HANA, or Memcached deployments by fully populating all memory channels with these 128GB modules, reaching 1.5TB or more per server. The octal-rank x4 organization delivers high bank-level parallelism, reducing access latency for large in-memory datasets. Pair with a CPU supporting high memory bandwidth to minimize stalls on the DDR4-2666 interface during peak transaction bursts.
High-Performance Computing
Scale memory capacity to multi-terabyte levels by installing 12 or 16 of these RDIMMs per dual-socket node, critical for finite element analysis or computational fluid dynamics workloads. Registered ECC memory eliminates silent data corruption during long simulation runs that span days. Opt for the 1.2V operating voltage to curb thermal output in dense clusters, preserving rack power budgets without sacrificing reliability.
Rigorously tested server RDIMM: compatible with Dell PowerEdge R760, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650.
Q: Can I mix this M386AAK40B40-CWD6Y with other memory modules of different brands or speeds?
A: Mixing is not recommended for server environments. Mismatched modules can cause instability or failure to POST. For guaranteed reliability, use identical part numbers across all channels.
Q: Is this memory compatible with my system? (Intel/AMD server platforms)
A: This RDIMM is compatible with Intel Xeon Scalable and AMD EPYC platforms supporting DDR4-2666. Always verify your server board’s qualified vendor list to ensure seamless integration.
Q: What is the recommended DIMM population order for optimal performance?
A: Follow your server motherboard’s manual. Typically, populate identical DIMMs starting with the farthest slot per channel, matching ranks to enable balanced memory interleaving for maximum throughput.
Q: Does this module support overclocking or XMP profiles?
A: No. This is a JEDEC-compliant DDR4-2666 registered DIMM designed for server reliability. It does not support XMP or overclocking, ensuring 24/7 operational stability.
Q: What warranty and typical failure rate can I expect?
A: It comes with a one-year warranty. The AFR is very low, typically under 0.5% in controlled environments, reflecting enterprise-grade quality and rigorous production testing.