Product Overview of the Samsung 64GB DDR5 RDIMM Memory

The Samsung M321R8GA0EB2-CCPHC is a premium-grade 64GB DDR5 server memory module engineered for enterprise servers, data centers, and professional workstations. With ultra-fast 6400MB/s speed, ECC support, and registered signal processing, this RAM ensures exceptional reliability, efficiency, and scalability for modern computing environments.

General Information

Manufacturer Details

• Brand: Samsung
• Part Number: M321R8GA0EB2-CCPHC
• Product Type: DDR5 SDRAM Memory Module

Technical Specifications

Memory Capacity and Architecture

• Storage Capacity: 64GB
• Rank Structure: 2Rx4

Memory Technology and Performance

• Memory Type: DDR5 SDRAM
• Bus Speed: DDR5-6400
• Bandwidth Rating: PC5-51200
• Operating Voltage: 1.1V

Compatibility

This Samsung DDR5 RDIMM memory module is compatible with a wide range of professional and enterprise systems, including:

• Enterprise-grade servers
• Rack and tower servers
• Data center infrastructure
• High-end workstations
• Cloud computing servers
• Virtualization platforms

Motherboard

• Must support DDR5 RDIMM (Registered DIMM)
• ECC support required
• 288-pin DDR5 memory slots
• BIOS support for DDR5-6400 speed

The Enterprise DDR5 RDIMM Memory Category

The category of enterprise-grade DDR5 Registered DIMM (RDIMM) memory represents the backbone of modern data centers, high-performance computing platforms, and mission-critical servers. Products like the Samsung M321R8GA0EB2-CCPHC 64GB 6400MBPS PC5-51200 2Rx4 ECC Registered 1.1V CL52 DDR5 SDRAM 288-Pin RDIMM Memory Kit define this class by combining extreme speed, reliability, and scalability into a single module design optimized for server workloads.

This memory category is not aimed at consumer desktops or gaming PCs. Instead, it targets environments where stability, error correction, multi-socket scalability, and continuous uptime are required. DDR5 RDIMM modules such as this Samsung model are commonly used in enterprise servers, cloud infrastructure, virtualization platforms, AI training clusters, and financial or scientific computing systems.

DDR5 RDIMM Matters in Modern Servers

DDR5 RDIMM memory introduces architectural improvements over DDR4 RDIMM, including higher bandwidth, increased bank groups, better power efficiency, and enhanced on-die error management. These advancements allow modern CPUs from Intel and AMD to reach their full potential by removing memory bottlenecks that previously limited performance in compute-heavy tasks.

In this category, the Samsung M321R8GA0EB2-CCPHC stands out with its 6400MBPS data rate and PC5-51200 classification, making it ideal for next-generation server platforms requiring ultra-fast memory throughput.

64GB High-Capacity Module

The 64GB capacity per module places this product firmly in the high-density memory category. High-capacity RDIMM modules are crucial for applications that require large memory pools such as in-memory databases, virtualization with many virtual machines, AI/ML training datasets, and big data analytics.

With 64GB per stick, system architects can populate fewer DIMM slots to reach very large total system memory capacities, which simplifies cooling, improves airflow, and reduces power overhead per gigabyte.

DDR5 PC5-51200 Performance

The PC5-51200 designation corresponds to a theoretical bandwidth of 51.2 GB/s per module. This level of throughput enables servers to handle massive parallel workloads with reduced latency and increased data movement efficiency.

In modern enterprise workloads, memory bandwidth often becomes more critical than raw CPU frequency. High-bandwidth memory like this category ensures that multi-core processors are continuously fed with data without stalling.

6400MBPS Data Transfer Speed

A 6400MT/s data rate places this memory in the upper tier of DDR5 RDIMM offerings. Such speed is particularly important in workloads involving real-time analytics, AI inference, financial modeling, and large-scale simulation, where memory access speed directly affects output latency and throughput.

This speed also makes the category well-suited for next-gen processors that support DDR5-6400 natively, ensuring full compatibility without downclocking.

ECC Registered Architecture

Enterprise Memory

Error-Correcting Code (ECC) memory detects and corrects single-bit errors and identifies multi-bit errors, significantly reducing the risk of data corruption. In mission-critical environments, even a small memory error can cause system crashes, corrupted databases, or financial losses.

ECC is a defining feature of this category, making modules like the Samsung M321R8GA0EB2-CCPHC essential for servers, rather than optional upgrades.

Registered (Buffered) Memory for Scalability

Registered DIMMs include a register (buffer) between the memory controller and DRAM chips. This design reduces the electrical load on the memory controller, enabling support for more DIMMs per channel and higher capacities.

This is why RDIMM memory is used in servers with 12, 16, or more memory slots per CPU, allowing massive memory scalability without compromising stability.

2Rx4 Rank

Benefits for Server Reliability

With x4 DRAM devices, memory controllers can isolate and recover from certain chip-level failures more effectively, improving overall system uptime and resilience.

CL52 for DDR5

CAS Latency (CL) indicates the delay between a memory request and data availability. While CL52 may appear high compared to DDR4 values, it is appropriate for DDR5 running at much higher frequencies.

When measured in actual time (nanoseconds), DDR5 CL52 often delivers similar or better real-world latency than slower DDR4 modules.

288-Pin RDIMM

The 288-pin RDIMM form factor is standardized for DDR5 server memory, ensuring compatibility with modern server motherboards from leading vendors such as Dell, HPE, Lenovo, Supermicro, and others.

This form factor ensures proper electrical connections, thermal design compatibility, and mechanical stability in rack-mounted systems.

Use Cases

Virtualization and Cloud Computing

High-capacity, high-speed RDIMM memory is essential in virtualization environments where dozens or hundreds of virtual machines share system resources. This category supports rapid memory access and large memory pools, reducing VM contention.

High-Performance Computing (HPC)

Scientific simulations, weather modeling, and computational physics rely on massive parallel computation. Memory like the Samsung M321R8GA0EB2-CCPHC ensures data is delivered to compute cores at the required speed.

Comparison DDR5 RDIMM vs DDR4 RDIMM

RDIMM vs LRDIMM

Load-Reduced DIMMs (LRDIMM) offer even higher capacities by buffering both address and data signals, but RDIMM strikes a balance between cost, performance, and capacity, making this category more widely adopted.

RDIMM vs UDIMM

UDIMM memory is not suitable for enterprise servers due to limited capacity support and lack of buffering. RDIMM memory ensures stability and scalability.