Samsung 64GB 4800MHz DDR5 PC5-38400 ECC Registered CL40 288-Pin DIMM 1.1V Dual Rank x4 Memory Module – M321R8GA0BB0-CQK

Samsung 64GB DDR5 4800MHz ECC Registered Server Memory — M321R8GA0BB0-CQK

The Samsung M321R8GA0BB0-CQK is a 64GB DDR5 ECC Registered (RDIMM) server memory module operating at 4800MHz (PC5-38400) with CAS latency CL40 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 Samsung”s proven enterprise-grade reliability
• RoHS Compliant: Meets global environmental and safety standards for enterprise deployments

Technical Specifications

• Part Number: M321R8GA0BB0-CQK
• Manufacturer: Samsung
• Memory Type: DDR5 SDRAM
• Module Type: RDIMM (Registered / Buffered)
• Capacity: 64GB
• Speed: 4800MHz (PC5-38400)
• CAS Latency: CL40
• Timing: 40-39-39
• 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 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 only — not backward compatible with DDR4 platforms
• CQK is the base qualification code for this Samsung 64GB DDR5 x4 RDIMM series — 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, allowing more chips per module and higher per-module capacity (64GB vs 32GB). x4 modules also benefit from Chip Kill ECC support on compatible platforms, providing stronger error correction than standard SECDED alone.

What does the CQK base qualification code indicate?

CQK is Samsung”s base qualification code for this 64GB DDR5 x4 RDIMM series. Variants with extended suffixes (CQKVG, CQKDS, CQKZL, etc.) are built on this base code and represent specific OEM or regional qualifications — always verify against your server vendor”s QVL before purchase.

Can I mix 64GB x4 modules with 32GB x8 modules in the same server?

Mixing different capacity or die organization modules is generally not recommended and may not be supported by your server platform. Consult your server vendor”s memory population guide and QVL before mixing module types.

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 M321R8GA0BB0-CQK delivers the 64GB DDR5 capacity, dual-layer ECC protection, and Samsung manufacturing quality your enterprise server infrastructure demands.