Samsung 64GB 5600MHz DDR5 PC5-44800 ECC Registered CL46 288-Pin DIMM 1.1V Dual Rank x4 Memory Module – M321R8GA0PB0-CWMJJ

Samsung 64GB DDR5 5600MHz ECC Registered Server Memory — M321R8GA0PB0-CWMJJ

The Samsung M321R8GA0PB0-CWMJJ is a 64GB DDR5 ECC Registered (RDIMM) server memory module operating at 5600MHz (PC5-44800) with CAS latency CL46 and 1.1V operating voltage. Built on Samsung”s advanced DDR5 x4 die architecture, this high-density 64GB module delivers exceptional memory bandwidth and capacity per slot — making it ideal for memory-intensive enterprise workloads including large-scale virtualization, in-memory databases, AI/ML inference, and high-performance computing. Error-Correcting Code (ECC) technology continuously detects and corrects single-bit memory errors in real time, ensuring data integrity in mission-critical environments. The registered (buffered) design reduces electrical load on the memory controller, enabling stable high-density multi-DIMM configurations across enterprise server platforms.

Key Features

• 64GB High-Density Capacity: Maximum memory per slot — reduce DIMM count while achieving high total system memory
• On-Die + System-Level ECC: Dual-layer error correction ensures maximum data integrity for mission-critical workloads
• Registered (Buffered) Design: Enables stable, high-density multi-DIMM server configurations without signal degradation
• Samsung x4 DRAM: High-density x4 die organization delivers 64GB per module with Chip Kill ECC support on compatible platforms
• RoHS Compliant: Meets global environmental and safety standards for enterprise deployments

Technical Specifications

• Part Number: M321R8GA0PB0-CWMJJ
• Manufacturer: Samsung
• Memory Type: DDR5 SDRAM
• Module Type: RDIMM (Registered / Buffered)
• Capacity: 64GB
• Speed: 5600MHz (PC5-44800)
• CAS Latency: CL46
• Timing: 46-45-45
• Voltage: 1.1V
• Form Factor: 288-Pin DIMM
• Rank: Dual Rank (2Rx4)
• Die Organization: x4
• Data Width: 72-bit (64-bit + 8-bit ECC)
• Error Correction: SECDED (Single-bit correction, Double-bit detection)
• Operating Temperature: 0°C to 85°C

Use Cases

• Large-Scale Virtualization: VMware vSphere, Microsoft Hyper-V, and KVM deployments requiring maximum memory capacity and bandwidth per server
• In-Memory Databases: SAP HANA, Oracle TimesTen, and Redis clusters demanding large, fast memory pools with fewer DIMMs
• AI/ML Inference: GPU-adjacent CPU memory for large language model inference and ML pipeline acceleration
• HPC Clusters: MPI-based scientific computing requiring high per-node memory capacity and bandwidth

Compatibility

• Compatible with DDR5 RDIMM slots supporting 5600MHz — verify your platform”s maximum supported DDR5 speed before ordering
• CWMJJ suffix denotes specific OEM or regional server vendor qualification — verify against your server”s memory QVL before ordering
• Do not mix with DDR5 UDIMMs, LRDIMMs, or x8 die modules in the same channel where rank mixing is restricted
• For multi-DIMM stability, populate channels with matched capacity, speed, and rank modules

Frequently Asked Questions

What is the difference between x4 and x8 die organization in DDR5 RDIMMs?

x4 die organization uses narrower 4-bit wide DRAM chips, enabling higher per-module capacity (64GB) and Chip Kill ECC support on compatible platforms — providing stronger error correction than standard SECDED alone for maximum data integrity.

What does the CWMJJ qualification suffix indicate?

Samsung uses qualification suffixes to denote OEM validation, regional certification, or specific server vendor testing. CWMJJ identifies this module”s exact qualification tier — always cross-reference with your server vendor”s memory compatibility or QVL list before purchase.

Can this module run at 4800MHz if my server does not support 5600MHz?

DDR5 modules are backward speed-compatible — if your server platform does not support 5600MHz, the module will typically train down to the platform”s maximum supported speed. However, always verify with your server vendor”s QVL to confirm supported configurations.

Whether you are maximizing per-server memory capacity for large-scale virtualization, accelerating in-memory database performance, or building out a high-density AI inference platform, the Samsung M321R8GA0PB0-CWMJJ delivers the 64GB DDR5 5600MHz bandwidth, dual-layer ECC protection, and Samsung manufacturing quality your enterprise server infrastructure demands.