M321R8GA0BB0-CQK Samsung 64GB SDRAM PC5-38400 Reg DDR5 RAM

Samsung PC5-38400 4800MHZ Reg DDR5 Memory

The Samsung M321R8GA0BB0-CQK is a high-capacity DDR5 SDRAM memory module engineered for modern server and workstation platforms that demand stability, scalability, and sustained throughput. Designed around next-generation DDR5 architecture, this registered DIMM delivers improved bandwidth efficiency, optimized power management, and enhanced reliability for data-intensive computing environments.

Product Details

• Manufacturer: Samsung
• Part Number: M321R8GA0BB0-CQK
• Product type: DDR5 Registered SDRAM Memory Module

Technical Specifications

• Capacity: 64GB
• Type: DDR5 RDIMM
• Speed: 4800MT/s (PC5-38400)
• Voltage: 1.1V
• CAS Latency: CL40
• Pin Configuration: 288-pin
• ECC Support: Yes
• Rank: Dual Rank

Advanced DDR5 SDRAM Architecture

• Next-generation DDR5 SDRAM design
• Enhanced bandwidth for multitasking server workloads
• Optimized signaling for reliable enterprise operation
• Improved power efficiency compared to DDR4 memory

Capacity and Module Layout

• Total memory capacity: 64GB
• Single-module design for flexible expansion
• Dual-rank configuration for optimized throughput
• Ideal for memory-intensive server tasks

Benefits of Registered DDR5 Memory

• Improved signal stability under heavy loads
• Support for higher memory densities
• Reduced strain on the memory controller
• Consistent performance in multi-DIMM configurations

ECC Advantages in Enterprise Systems

• Automatic detection and correction of memory errors
• Enhanced data integrity for critical applications
• Lower risk of system instability
• Essential for servers, virtualization, and databases

Recommended Usage Scenarios

• Enterprise servers and data centers
• Cloud computing infrastructures
• Virtualization and containerized platforms
• High-performance and memory-intensive applications

Technology Registered ECC DDR5 SDRAM Explained

The Samsung M321R8GA0BB0-CQK integrates two foundational server memory technologies: Registration (Buffering) and Error-Correcting Code (ECC), built upon the latest DDR5 standard. This combination is non-negotiable for mission-critical systems. A Registered DIMM (RDIMM) incorporates a register, or buffer, on the module itself. This register sits between the system's memory controller and the DRAM chips. Its primary function is to buffer the command and address signals sent to the memory chips.

Memory Capacity

RDIMMs allow servers to support significantly larger amounts of total RAM. The reduced load enables the motherboard to support more DIMMs per channel (often 2DPC - 2 DIMMs Per Channel) without overburdening the controller, facilitating configurations reaching multiple terabytes of memory in a single system.

The DDR5 Advantage

Building upon DDR4, the DDR5 architecture in the Samsung M321R8GA0BB0-CQK brings transformative improvements: With a data rate of 4800 Mega transfers per second (MT/s), labeled as PC5-38400 (where 38400 MB/s is the theoretical peak bandwidth per channel), DDR5 starts at speeds where high-end DDR4 topped out. This translates directly to higher available bandwidth for CPU cores, reducing bottlenecks in data-intensive workloads. Each DDR5 DIMM is organized into two independent 32-bit sub-channels. While a server RDIMM still presents a single 72-bit channel (64 data + 8 ECC) to the memory controller, internal management can improve efficiency and reduce latency for certain access patterns compared to DDR4's single 64-bit channel.

RDIMM vs. Unbuffered DIMM (UDIMM)

UDIMMs are the standard for desktops and laptops. They have no register, resulting in slightly lower latency for a single module. However, they place a full electrical load on the memory controller, severely limiting how many can be installed per channel (usually 1 or 2) and total system capacity. RDIMMs are the clear choice for any scalable, multi-DIMM server configuration.

RDIMM vs. Load Reduced DIMM (LRDIMM)

LRDIMMs take buffering a step further by also buffering the data signals, not just command/address. This reduces the electrical load even more than an RDIMM, enabling the highest possible capacities and population densities (e.g., 3DPC). However, this added buffer introduces slightly higher latency and cost. The Samsung 64GB RDIMM offers an excellent balance of capacity, performance, and cost for the majority of 1DPC and 2DPC server deployments.

Form Factor: Reg

The Samsung M321R8GA0BB0-CQK RAM features a Reg form factor, which stands for Registered. This form factor offers several benefits in terms of reliability, stability, and compatibility for your system.

Stability

The Registered form factor provides enhanced stability by adding an extra buffer between the memory controller and the DRAM modules. This buffer helps reduce electrical load and signal noise, resulting in improved signal integrity. Enjoy a stable computing experience without worrying about memory errors or data corruption.

Reliable Performance

When it comes to critical applications that require continuous operation and data integrity, reliability is paramount. The Registered form factor provides additional error-checking and correction capabilities, ensuring reliable performance even under heavy workloads. Trust in the Samsung M321R8GA0BB0-CQK RAM's Reg form factor for consistent and dependable memory operations. 

Physical Design and Form Factor Specifications

Built in a standard 288-pin RDIMM form factor, this Samsung DDR5 module ensures compatibility with a wide range of modern server and workstation motherboards. Its compact physical profile supports dense system configurations without compromising airflow or thermal performance.

Reliability

Samsung's rigorous testing and validation processes ensure that each module, including the M321R8GA0BB0-CQK, meets extreme standards for performance and longevity. This results in lower failure rates, higher mean time between failures (MTBF), and predictable performance—critical metrics for enterprise IT procurement.

Compatibility

4800MT/s is the foundational JEDEC standard speed for first-generation DDR5 platforms. This makes the Samsung M321R8GA0BB0-CQK a universally compatible, plug-and-play solution for a wide array of server and workstation platforms based on Intel Xeon Scalable Processors (Sapphire Rapids, Emerald Rapids) and AMD EPYC 9004 "Genoa" series processors. It provides the optimal balance of high performance, excellent stability, and broad compatibility without requiring BIOS or firmware adjustments for overclocked speeds.