Samsung 64GB 2666MHz DDR4 PC4-21300 ECC Registered CL19 288-Pin Load Reduced DIMM 1.2V Quad Rank x4 Memory Module – M386A8K40BM2-CTD

Samsung 64GB DDR4 2666MHz ECC Load Reduced Server Memory — M386A8K40BM2-CTD

The Samsung M386A8K40BM2-CTD is a 64GB DDR4 ECC Load Reduced DIMM (LRDIMM) server memory module operating at 2666MHz (PC4-21300) with CAS latency CL19 and 1.2V operating voltage. This high-density 64GB Quad Rank x4 LRDIMM uses a memory buffer to reduce electrical load on the memory controller — enabling higher DIMM counts per channel than standard RDIMMs while maintaining signal integrity. Error-Correcting Code (ECC) technology continuously detects and corrects single-bit memory errors in real time, ensuring data integrity in mission-critical environments.

Key Features

• 64GB High-Density LRDIMM: Maximum DDR4 LRDIMM capacity per slot for memory-intensive enterprise workloads
• Load Reduced (LRDIMM) Design: Memory buffer reduces electrical load on the controller, enabling higher DIMM density per channel than standard RDIMMs
• ECC Error Protection: Real-time single-bit error correction ensures data integrity for mission-critical server workloads
• Samsung DRAM: Industry-leading manufacturing quality with proven enterprise-grade reliability and longevity
• RoHS Compliant: Meets global environmental and safety standards for enterprise deployments

Technical Specifications

• Part Number: M386A8K40BM2-CTD
• Manufacturer: Samsung
• Memory Type: DDR4 SDRAM
• Module Type: LRDIMM (Load Reduced DIMM)
• Capacity: 64GB
• Speed: 2666MHz (PC4-21300)
• CAS Latency: CL19
• Timing: 19-19-19
• Voltage: 1.2V
• Form Factor: 288-Pin DIMM
• Rank: Quad Rank (4Rx4)
• 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

• High-Density Virtualization: VMware vSphere, Microsoft Hyper-V, and KVM deployments requiring maximum memory capacity per DDR4 server node
• In-Memory Databases: SAP HANA, Oracle TimesTen, and Redis clusters requiring large memory pools on DDR4 LRDIMM platforms
• HPC Clusters: MPI-based scientific computing requiring high per-node memory capacity on DDR4 platforms
• High-Density Infrastructure: Memory expansion for existing DDR4 LRDIMM server deployments requiring maximum capacity per slot

Compatibility

• Compatible with DDR4 LRDIMM slots only — not compatible with DDR4 RDIMM, UDIMM, DDR5, or DDR3 platforms
• CTD is the base qualification code for this Samsung 64GB DDR4 2666MHz Quad Rank x4 LRDIMM BM2 series — verify against your server”s memory QVL before ordering
• Do not mix LRDIMMs with RDIMMs or UDIMMs in the same system
• For multi-DIMM stability, populate channels with matched capacity, speed, and rank modules

Frequently Asked Questions

What is the difference between an LRDIMM and an RDIMM?

An LRDIMM (Load Reduced DIMM) uses a memory buffer chip to isolate DRAM from the memory controller, reducing electrical load and enabling more DIMMs per channel than standard RDIMMs. This allows higher total system memory capacity at the cost of slightly higher latency. LRDIMMs and RDIMMs are not interchangeable.

What does the CTD base qualification code indicate?

CTD is Samsung”s base qualification code for this 64GB DDR4 2666MHz Quad Rank x4 LRDIMM BM2 series. The CTD7Y variant represents a specific OEM or regional qualification — always verify against your server vendor”s QVL before purchase.

Is this module compatible with DDR5 servers?

No — DDR4 LRDIMMs are only compatible with DDR4 LRDIMM-capable server platforms. Always verify your server”s memory type and DIMM type requirements before ordering.

Whether you are maximizing per-server memory capacity for large-scale virtualization, accelerating in-memory database performance, or expanding a high-density DDR4 server infrastructure, the Samsung M386A8K40BM2-CTD delivers the 64GB DDR4 LRDIMM capacity, ECC protection, and Samsung manufacturing quality your enterprise server environment demands.