SAMSUNG 32GB M393A4K40CB2 2RX4 PC4-2666V

SAMSUNG 32GB M393A4K40CB2 2RX4 PC4-2666V

SAMSUNG M393A4K40CB2 is a 32GB DDR4 SDRAM module designed specifically for servers and enterprise systems. It operates at a 2666 MHz speed (PC4-2666V) and uses Error-Correcting Code (ECC) technology with Registered (RDIMM) buffering for enhanced data integrity and reliability.

Technical Specifications

Memory Type and Capacity

This module is a DDR4 SDRAM memory stick with a 32 GB capacity, making it well suited for environments that demand substantial memory, such as virtualization, large databases, and intensive computing tasks.

Bus Speed & PC4-2666V Standard

The “PC4-2666V” designation refers to its data transfer performance—about 2666 million data transfers per second—which translates to smooth multitasking and quick access times compared with older memory standards.

CAS Latency and Timings

With a CAS latency (CL) of 19, this module balances speed and stability, ensuring predictable performance in demanding workflows.

Voltage & Power Efficiency

Running at a low 1.2 V, this memory is efficient in power usage, reducing heat and energy costs over long server uptime.

What Does 2RX4 Mean?

Understanding Memory Rank

The “2Rx4” label describes how the memory chips are organized internally—2 ranks with x4 data width—which improves performance and reliability in multi-core server CPUs.

Benefits of Dual-Rank Modules

Dual-rank designs can improve performance under heavy loads compared to single-rank modules. They also help servers manage workloads more efficiently.

ECC Registered (RDIMM) Explained

What is ECC Memory?

ECC stands for Error-Correcting Code, a type of memory that can detect and correct single-bit errors on the fly—vital for mission-critical systems where data integrity is non-negotiable.

Registered vs. Unbuffered Memory

Registered memory (RDIMM) uses an additional register to buffer commands, improving stability and scalability in servers compared with unbuffered modules typically found in desktops.

Why ECC RDIMM Matters for Servers

ECC RDIMM modules reduce data corruption and system crashes—making them essential for enterprise servers, cloud platforms, and critical workloads.

Performance Features

Fast Data Transfer Rates

With DDR4-2666 speed, this module delivers fast performance suitable for virtualization, database processing, and complex analytics.

Reliability in High-Demand Environments

The combination of ECC and registered design provides enterprise-grade reliability—especially important in data centers where uptime matters.

Compatibility

Supported Hardware Platforms

These memory sticks are compatible with most server motherboards supporting DDR4 ECC RDIMM formats (e.g., Dell, HPE, Supermicro).

Server vs. Desktop Compatibility

Unlike standard desktop RAM, RDIMM ECC modules will not work in consumer motherboards due to differences in support for ECC and registered architecture.

Real-World Use Cases

Data Centers & Virtualization

Large memory capacity allows virtual machines to run simultaneously with minimal latency.

Enterprise Workloads & Databases

High-capacity ECC memory improves database reliability and reduces crash risks during critical transactions.

Scientific & Analytic Computing

DDR4-2666 modules are ideal for analytics workloads requiring stable, fast memory access.

Installation & Best Practices

How to Install Server Memory

Always power down and discharge static before installing into DDR4-compatible DIMM slots.

Pairing Modules

For balanced performance, install memory modules in matched pairs across channels.

Buying Guide

New vs. Refurbished Modules

Refurbished options (like the refurbished versions of this module) are available at lower cost but verify warranty and condition.

Price Considerations

Prices can vary widely based on condition, batch, and vendor; reputable sellers often offer better support.

Warranty & Vendor Trust

Look for reputable vendors who offer returns and warranties to protect your investment.

Troubleshooting & Tips

Common Issues

If memory isn’t detected, check BIOS settings or ensure it’s installed in the correct slots.

BIOS Memory Settings

Ensure ECC and registered memory support is enabled in server BIOS for optimal performance.

Future-Proofing Your Server RAM

Planning for Upgrades

Consider modules with higher capacity or newer DDR5 formats for future servers.

DDR4 vs. DDR5 Trends

DDR5 offers higher throughput and efficiency but requires compatible platforms—still, DDR4 remains a strong choice for many servers today.