M321R4GA3PB0-CWMJH Samsung 32GB PC5-44800 Memory Module 288-Pin SDRAM

• Manufacturer: Samsung
• Part Number: M321R4GA3PB0-CWMJH
• Product Type: 32GB DDR5 SDRAM Registered Memory Module

Technical Information

• Capacity: 32GB
• Technology: DDR5 SDRAM
• Module Configuration: 1 × 32GB RDIMM
• Bus Speed: PC5-44800 / DDR5-5600
• Data Protection: ECC (Error-Correcting Code)
• Signal Control: Registered
• Form Factor: 288-Pin RDIMM
• Compatibility: DDR5-RDIMM supported servers and workstations

• Premium Samsung semiconductor quality for robust service life
• Powerful DDR5 bandwidth for faster processing and smoother multitasking
• ECC + RDIMM for superior reliability and reduced downtime risk
• Ideal 32GB single-module capacity for scalable multi-DIMM configurations
• Compatible with a wide array of next-generation servers

Speed & Bandwidth: PC5-44800

The PC5-44800 designation is crucial. M321R4GA3PB0-CWMJH "PC5" identifies it as DDR5. The number "44800" refers to the module's theoretical peak transfer rate in megabytes per second (MB/s). This equates to a data rate of 5600 megatransfers per second (MT/s), often marketed as DDR5-5600. This high speed dramatically reduces latency and increases the throughput between the CPU and memory, alleviating bottlenecks in data-intensive applications like in-memory databases, virtualization, and scientific computing.

Comparing Generations: DDR5 vs. DDR4

DDR5 architecture brings fundamental improvements. It operates at a lower voltage (1.1V typical) for increased efficiency, features a burst length doubled to 16, and incorporates on-die ECC for internal data reliability. The most significant change is the move to a dual 32-bit sub-channel architecture per module (instead of a single 64-bit channel in DDR4). This allows for more efficient data handling and reduces contention, effectively increasing overall memory access efficiency.

Capacity : 32GB 

The 32GB M321R4GA3PB0-CWMJH capacity represents a sweet spot in the server memory hierarchy, balancing high density with broad compatibility. It allows system builders to achieve substantial total memory configurations (e.g., 256GB across 8 DIMM slots, 512GB across 16) without venturing into the premium cost territory of higher-density 64GB or 128GB modules. This capacity is ideal for a wide range of applications from mainstream enterprise servers to high-end workstations.

Error-Correcting Code (ECC) Memory

ECC is a non-negotiable feature for critical systems. It detects and corrects the most common types of internal data corruption. Single-bit errors (a "flipped" bit) are corrected on the fly, while multi-bit errors are detected and reported. This prevents software crashes, data corruption, and system instability that can be caused by cosmic rays, electrical interference, or minute hardware flaws. The Samsung module employs a sophisticated ECC algorithm to ensure data remains pristine.

The 288-Pin RDIMM Design

The module utilizes a 288-pin edge connector, M321R4GA3PB0-CWMJH which is the standard for DDR5 modules and is physically and electrically incompatible with DDR4's 288-pin design (the key notch is in a different position). The RDIMM form factor is slightly taller than a standard UDIMM and is keyed specifically for server and workstation motherboards.

Thermal Management

Server modules often operate in high-ambient-temperature environments. The Samsung M321R4GA3PB0-CWMJH is designed with robust thermal components. The DDR5 standard also introduces a more advanced On-Die Thermal Sensor (ODTS) with finer granularity, allowing the system to better monitor and manage temperatures for optimal performance and longevity.

Advanced DDR5 SDRAM Architecture

The transition to DDR5 SDRAM introduces vast improvements in internal chip structure, data channel partitioning, and power management. This module offers a major leap in transfer speeds—running at 5600 MT/s (PC5-44800)—delivering higher efficiency for multi-threaded and parallel workloads. Thanks to its 2Rx8 configuration, it handles demanding tasks with impressive throughput and efficiency. By leveraging advanced memory banks, upgraded PMIC (Power Management IC), and strengthened signal hardware, the Samsung DDR5 series minimizes latency while dramatically improving queue handling. System builders and IT professionals benefit from improved server boot times, smoother virtualization, and increased headroom for compute-heavy applications.

Flexibility

With a 288-pin design, this memory module offers flexibility in terms of future upgradability. M321R4GA3PB0-CWMJH If you plan to expand your system's memory capacity further down the line, the 288-pin configuration provides options for adding additional modules without any compatibility issues.

Compatibility 

This Samsung RDIMM M321R4GA3PB0-CWMJH module is compatible with numerous server families that support DDR5 ECC Registered memory. It is commonly used in virtualization servers, file and domain controllers, engineering workstations, and cloud appliances. Its stable architecture makes it an excellent upgrade choice for organizations enhancing their DDR5-based computing infrastructure. The 288-pin pin type is commonly used in various systems and motherboards, making it widely compatible across different brands and models. Whether you have a custom-built PC or a branded system, this memory module's 288-pin design ensures that it integrates seamlessly.