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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 |
This 128GB DDR4-2666 Registered ECC RDIMM is designed for dual-processor enterprise servers, excelling in memory-intensive workloads including large-scale virtualization, in-memory databases, and data analytics platforms. Its octal-rank x4 organization maximizes DIMM capacity per channel while registered buffering and ECC deliver exceptional signal integrity and end-to-end data protection under sustained heavy loads.
1. A massive 128GB capacity per module allows dense server consolidation, running more virtual machines and large in-memory databases on a single node without sacrificing performance.
2. Integrated ECC continuously detects and corrects single-bit errors, protecting transactional and analytical workloads from silent data corruption in 24/7 operations.
3. Registered signal buffering stabilizes address and command paths, enabling fully populated multi-DIMM channels essential for scaling total system memory to terabyte levels.
4. The Octal Rank x4 architecture leverages deep rank interleaving to keep data buses highly utilized, accelerating parallel request handling in virtualized and big-data environments.
5. DDR4-2666 speed delivers a balanced 21.3 GB/s of sustained bandwidth per channel, efficiently feeding multi-core CPUs through heavy database queries and concurrent user loads.
Engineered for the data center, the M393AAK40B42-CWD is a 128GB DDR4-2666 Registered DIMM, and its four defining characteristics directly resolve the acute pain points of enterprise server environments. First, ECC error correction acts as a silent guardian for your mission-critical operations. In memory-intensive databases like SAP HANA or in virtualized clusters hosting financial transactions, a single bit-flip caused by cosmic radiation can corrupt results without warning. ECC detects and repairs these errors in real time, meaning your data integrity stays absolute and audit trails remain flawless. Second, the registered signal buffer stabilizes command and address lines, enabling a motherboard to support this massive 128GB module—and multiple modules—without signal degradation. For a virtualization host running dozens of VMs, that translates to rock-solid uptime and the elimination of cryptic, memory-related crashes. Third, the 128GB density allows you to pack 1.5TB into a 12-slot server, maximizing VM density and slashing licensing costs for in-memory databases. Finally, the Octal Rank x4 architecture leverages rank interleaving to dramatically boost effective bandwidth, so simultaneous analytics queries across large datasets complete faster. For your real-time analytics and virtualized infrastructure, these innovations deliver uncompromised reliability, lower latency, and the confidence to scale without limits.
General Virtualization
For dense virtualization hosts, this 128GB RDIMM is ideal to maximize memory capacity per socket while preserving channel balance. Populate all memory channels symmetrically—commonly one DIMM per channel (1DPC) with two sockets to deliver 1TB to 2TB total, ensuring ample headroom for hundreds of moderate VMs without NUMA penalties.
In-Memory Database
In-memory databases like SAP HANA or Redis demand both capacity and reliability; this ECC Registered module is a perfect fit. Deploy configurations that fill every channel with a single 128GB DIMM to reach 1.5TB–3TB per node, sustaining large datasets entirely in RAM while ECC guards against data corruption at CL19 latency.
High-Performance Computing (HPC)
HPC workloads require maximum bandwidth, so configure fully populated channels with one 128GB DIMM per channel at 2666 MT/s to balance capacity and speed. For dual‑socket nodes, this easily scales to 2TB or more, providing the large, contiguous memory pools essential for simulation checkpointing and parallel I/O without swapping.
Rigorously tested, compatible with Dell PowerEdge R740, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650, and Supermicro X11 systems.
Q: Can I mix this M393AAK40B42-CWD with other memory modules of different brands or speeds?
A: Mixing with other modules is not advised. Mismatched brands, speeds, or ranks may cause instability, unbootable states, or ECC errors. For reliable enterprise operation, populate with identical Samsung RDIMMs to ensure signal integrity and validated performance.
Q: Is this memory compatible with my server platform, such as Intel Xeon or AMD EPYC?
A: This 288-pin DDR4-2666 Registered ECC module is compatible with most dual-socket Intel Xeon Scalable (Purley) and AMD EPYC 7001 series platforms. Confirm your server's qualified vendor list supports 128GB Octal Rank x4 RDIMMs and specific firmware revisions.
Q: What is the recommended DIMM population order for optimal performance?
A: Follow your server motherboard’s memory slot numbering guide. Typically populate identical modules per channel, starting from the farthest slot from the CPU. Balance channels for interleaving and always install matching pairs to maximize throughput.
Q: Does this module support overclocking or XMP profiles?
A: No. As a server-grade Registered DIMM, this module strictly adheres to JEDEC DDR4-2666 (PC4-21300) standards at CL19. It does not support XMP or overclocking; stability and data integrity are prioritized over frequency manipulation.
Q: What warranty and typical failure rate can I expect for this memory?
A: This Samsung memory comes with a 1-year warranty. Enterprise RDIMMs are built with stringent quality controls, delivering an annualized failure rate (AFR) typically below 0.5% under specified operating conditions, ensuring mission-critical reliability.