M393AAK40B42-CWD7Q Samsung 128GB DDR4-2666MHz ECC Registered Memory

Samsung M393AAK40B42-CWD7Q 128GB RAM

The M393AAK40B42-CWD7Q Samsung 128GB DDR4-2666MHz ECC Registered Memory is a high-capacity server-grade module engineered for reliability and speed. Designed for enterprise workloads, this memory ensures stability and efficiency in demanding environments.

Main Information

• Brand: Samsung
• Model Number: M393AAK40B42-CWD7Q
• Category: 128GB DDR4 SDRAM Registered ECC Module

Technical Specifications

Memory Capacity & Type

• Storage Size: 128GB
• Technology: DDR4 SDRAM with ECC (Error-Correcting Code)

Performance Details

• Speed: 2666 MHz (PC4-21300 / PC4-2666V-R)
• Rank Structure: 8Rx4 (Octal Rank) or 2S4RX4 with 3DS stacking
• Latency: CL19 or CL22 depending on operational mode
• Operating Voltage: 1.2V

Form Factor

• Design: 288-pin DIMM

Physical Dimensions & Weight

Measurements

• Length: ~133.35 mm (5.25 inches)
• Height: Standard profile 31.25 mm (1.23 inches)
• Thickness: ~3.8 mm to 3.9 mm

Weight

• Approximate Mass: 0.023 kg to 0.045 kg (0.05 lbs to 0.1 lbs)

Key Benefits

Enhanced Reliability

• ECC technology ensures error detection and correction
• Stable performance for mission-critical applications

High Performance

• 2666 MHz speed for faster data processing
• Optimized latency for smoother operations

Enterprise-Ready Design

• Registered DIMM structure for server compatibility
• Durable build with efficient thermal management

Enterprise-Grade DDR4 Registered Memory Architecture

The Samsung M393AAK40B42-CWD7Q 128GB DDR4 Registered DIMM belongs to a high-capacity enterprise memory category engineered for data centers, mission-critical servers, and advanced workstation platforms. This category focuses on server-class DDR4 RDIMM modules that deliver stability, scalability, and consistent performance under sustained workloads. Designed around the PC4-21300 standard, this memory category supports demanding enterprise environments where uptime, data integrity, and predictable latency are essential operational requirements.

DDR4 registered memory modules in this segment incorporate a register between the memory controller and DRAM chips, allowing for reduced electrical load and improved signal integrity. This design enables systems to scale memory capacity far beyond unbuffered solutions while maintaining stable operation. The 128GB capacity per module positions this product category for virtualization hosts, database servers, in-memory analytics platforms, and large-scale enterprise applications that require dense memory configurations.

High-Density 128GB Capacity Design

This category emphasizes ultra-high-density memory modules capable of delivering exceptional memory footprint within limited physical slots. A single 128GB DIMM dramatically reduces the number of modules required to reach terabyte-scale memory configurations. This design approach simplifies system architecture, improves airflow efficiency, and lowers power consumption per gigabyte when compared to configurations using multiple lower-capacity modules.

High-density DDR4 RDIMMs are particularly valuable in enterprise server deployments where CPU memory channels are limited. By maximizing capacity per slot, administrators can fully populate systems while preserving expansion headroom. The Samsung M393AAK40B42-CWD7Q aligns with this category objective by offering a balanced combination of density, speed, and reliability suitable for modern multi-socket server platforms.

Octal Rank Memory Organization

The octal rank configuration used in this memory category enables advanced memory interleaving and improved throughput across multiple ranks. Octal rank architecture allows large-capacity modules to maintain efficiency while supporting higher overall memory bandwidth at the system level. This is particularly beneficial in environments where large datasets are accessed concurrently by multiple processes or virtual machines.

Rank-based memory organization plays a crucial role in optimizing memory controller utilization. With eight ranks per module, systems can distribute access patterns more effectively, reducing contention and improving overall memory performance consistency. This characteristic makes octal rank DDR4 RDIMMs a preferred choice for enterprise workloads that require predictable memory access behavior.

Signal Integrity and Load Reduction Benefits

Registered DIMM technology significantly improves signal integrity by buffering address and command signals. This feature is critical for high-capacity modules where signal degradation could otherwise limit performance or stability. The category’s design ensures that even with multiple high-density DIMMs installed, the memory subsystem remains stable under heavy computational load.

DDR4-2666MHz Key Characteristics

The DDR4-2666MHz frequency defines a performance-focused category optimized for balanced throughput and latency. Operating at 2666MHz, these modules deliver data transfer rates suitable for enterprise applications without compromising stability. The PC4-21300 specification reflects a bandwidth level that supports multi-core processors and parallel workloads commonly found in modern servers.

This performance tier is widely adopted across enterprise platforms due to its proven compatibility and reliability. DDR4-2666MHz memory provides sufficient bandwidth to feed multi-core CPUs while maintaining efficient power usage. As a result, this category remains a cornerstone in data center memory configurations where cost efficiency and dependable performance are equally important.

CL19 Latency Optimization

CAS latency 19 represents a carefully balanced timing configuration within this memory category. CL19 ensures responsive data access while maintaining stability across large memory arrays. Enterprise memory prioritizes consistency over aggressive timing, making CL19 an optimal choice for sustained workloads that demand reliable response times rather than peak benchmark performance.

Latency optimization in this category focuses on maintaining uniform access times across all installed modules. This uniformity is essential in multi-DIMM configurations where mismatched timings could otherwise lead to performance bottlenecks or system instability.

Bandwidth Efficiency in Multi-Socket Systems

In dual-socket and quad-socket server environments, DDR4-2666MHz RDIMMs provide efficient bandwidth scaling across multiple memory channels. This category is engineered to support NUMA architectures, ensuring that memory access remains efficient regardless of processor topology. Such efficiency is vital for virtualization platforms, high-performance computing clusters, and enterprise database servers.

Error Correction Code Reliability Standards

ECC registered memory is a defining characteristic of this category, providing robust data integrity protection. Error Correction Code technology automatically detects and corrects single-bit memory errors while identifying multi-bit errors. This capability significantly reduces the risk of data corruption, system crashes, and application failures in mission-critical environments.

ECC memory is essential for enterprise workloads where data accuracy directly impacts operational outcomes. Financial systems, healthcare databases, and large-scale transactional platforms rely on ECC protection to maintain data consistency. The Samsung M393AAK40B42-CWD7Q aligns with this category by delivering enterprise-grade ECC functionality validated for continuous operation.

Continuous Operation and Stability

This memory category is designed for 24/7 operation under sustained load. ECC registered modules undergo extensive validation to ensure stability across temperature variations, voltage fluctuations, and prolonged usage. Such resilience is a critical requirement for data centers where downtime can result in significant financial and operational losses.

Reduced Risk of Silent Data Corruption

Silent data corruption poses a serious threat in large memory systems. ECC technology within this category actively mitigates this risk by correcting errors before they propagate through applications or storage layers. This proactive protection enhances overall system reliability and extends hardware lifespan.

1.2V Power Efficiency and Thermal Management

Operating at 1.2 volts, this DDR4 memory category delivers improved power efficiency compared to previous generations. Lower operating voltage reduces overall system power consumption, contributing to lower operational costs in large-scale deployments. This efficiency also supports higher memory densities without excessive thermal output.

Thermal management is a critical consideration in enterprise memory design. By reducing voltage requirements, DDR4 RDIMMs generate less heat, enabling more efficient cooling strategies. This is especially valuable in dense server racks where airflow optimization is essential for maintaining performance and reliability.

Energy Efficiency in Large Memory Pools

High-capacity memory configurations can consume substantial power. This category addresses that challenge by combining high density with low-voltage operation. The result is a memory solution that scales efficiently while minimizing the energy footprint of the overall system.

Compatibility with Advanced Cooling Solutions

DDR4 RDIMMs in this category are compatible with both air-cooled and liquid-cooled server architectures. Reduced thermal output allows these modules to perform reliably in high-density deployments where cooling efficiency directly impacts system performance and longevity.

288-Pin DIMM Form Factor and Platform Compatibility

The 288-pin DIMM form factor defines a standardized category compatible with a wide range of enterprise server motherboards. This form factor ensures mechanical stability, reliable electrical connectivity, and broad platform support across leading server manufacturers. Standardization simplifies system integration and maintenance while enabling flexible upgrade paths.

This category is specifically tailored for DDR4-enabled server platforms that support registered memory. Compatibility extends across multiple processor generations, making these modules suitable for both new deployments and memory upgrades in existing infrastructure.

Server and Workstation Integration

Enterprise-grade DDR4 RDIMMs are commonly used in rack servers, blade servers, and high-performance workstations. The category supports memory-intensive professional applications such as virtualization management, scientific modeling, and large-scale content creation. The standardized DIMM design ensures seamless installation and consistent performance across supported platforms.

Scalability Across Memory Channels

Multi-channel memory architectures benefit significantly from registered DIMMs. This category allows systems to populate all available memory channels without compromising signal quality. As a result, overall memory throughput and capacity scaling remain efficient even in fully populated configurations.

Enterprise Workload Optimization and Use Case Alignment

This memory category is optimized for enterprise workloads that demand high capacity, reliability, and consistent performance. Virtualization environments benefit from large memory pools that support numerous virtual machines with minimal contention. Database servers rely on high-capacity RDIMMs to cache large datasets in memory, reducing latency and improving transaction throughput.

In-memory analytics platforms and enterprise resource planning systems also align closely with this category. These applications require rapid access to large datasets while maintaining data integrity. DDR4 ECC registered memory provides the foundation necessary to meet these requirements reliably.

Virtualization and Cloud Infrastructure

Cloud service providers and private virtualization clusters depend heavily on high-density memory modules. This category supports dense virtual machine deployments by maximizing memory per socket and reducing hardware complexity. Improved memory density translates into higher consolidation ratios and more efficient resource utilization.

Database and Transactional Systems

High-performance databases benefit from large memory capacities that minimize disk access. DDR4 RDIMMs in this category enable extensive caching and buffer management, improving query response times and transaction consistency. ECC protection further ensures that critical data remains accurate during continuous operation.