Samsung 128GB DDR4 2933MHz ECC Load Reduced Server Memory — M386AAG40MMB-CVFCQ

The Samsung M386AAG40MMB-CVFCQ is a 128GB DDR4 ECC Load Reduced DIMM (LRDIMM) server memory module operating at 2933MHz (PC4-23400) with CAS latency CL21 and 1.2V operating voltage. This ultra-high-density 128GB Quad Rank x4 LRDIMM uses a memory buffer to reduce electrical load on the memory controller — enabling the highest total system memory configurations on DDR4 LRDIMM-capable server platforms at peak DDR4 bandwidth. 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

• 128GB Ultra-High Density LRDIMM: Maximum DDR4 LRDIMM capacity per slot — achieve the highest possible total system memory on DDR4 platforms
• 2933MHz — Highest DDR4 Speed: PC4-23400 delivers maximum DDR4 memory bandwidth for bandwidth-sensitive 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

Technical Specifications

• Part Number: M386AAG40MMB-CVFCQ
• Manufacturer: Samsung
• Memory Type: DDR4 SDRAM
• Module Type: LRDIMM (Load Reduced DIMM)
• Capacity: 128GB
• Speed: 2933MHz (PC4-23400)
• CAS Latency: CL21
• Timing: 21-21-21
• 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

• Massive-Scale Virtualization: VMware vSphere, Microsoft Hyper-V, and KVM deployments requiring the highest possible memory capacity per DDR4 server node
• In-Memory Databases: SAP HANA, Oracle TimesTen, and VoltDB deployments requiring terabyte-scale memory pools at peak DDR4 bandwidth
• HPC and Scientific Computing: MPI-based simulation and modeling workloads requiring maximum per-node memory capacity on DDR4 platforms
• High-Density Infrastructure: Maximum capacity memory expansion for existing DDR4 LRDIMM server deployments

Compatibility

• Compatible with DDR4 LRDIMM slots only — not compatible with DDR4 RDIMM, UDIMM, DDR5, or DDR3 platforms
• CVFCQ suffix denotes specific OEM or regional server vendor qualification — verify against your server's memory QVL before ordering
• Do not mix LRDIMMs with RDIMMs or UDIMMs in the same system
• Verify your server platform's support for 128GB DDR4 LRDIMMs and per-channel DIMM limits before ordering

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 CVFCQ qualification suffix indicate?

Samsung uses qualification suffixes to denote OEM validation, regional certification, or specific server vendor testing. CVFCQ identifies this module's exact qualification tier — always cross-reference with your server vendor's memory compatibility or QVL list 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 building terabyte-scale DDR4 virtualization clusters, deploying in-memory database infrastructure at peak DDR4 bandwidth, or maximizing per-node memory capacity, the Samsung M386AAG40MMB-CVFCQ delivers the 128GB DDR4 2933MHz LRDIMM capacity, ECC protection, and Samsung manufacturing quality your most demanding enterprise server deployments require.