Samsung 128GB DDR4 2400MHz ECC Load Reduced Server Memory — M393AAK40B41-CTC40

The Samsung M393AAK40B41-CTC40 is a 128GB DDR4 ECC Load Reduced DIMM (LRDIMM) server memory module operating at 2400MHz (PC4-19200) with CAS latency CL19 and 1.2V operating voltage. This ultra-high-density 128GB Octa Rank module uses a memory buffer to reduce electrical load on the memory controller — enabling the highest possible total system memory configurations on DDR4 LRDIMM-capable server platforms. Designed for the most memory-intensive enterprise workloads including large-scale virtualization, in-memory databases, AI/ML infrastructure, and high-performance computing, this module delivers maximum DDR4 capacity per slot. 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: Maximum DDR4 capacity per slot — achieve the highest possible total system memory per server node
• Octa Rank LRDIMM Design: Memory buffer isolates DRAM from the controller, enabling 8-rank high-density modules that would otherwise overload standard RDIMM channels
• 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: M393AAK40B41-CTC40
• Manufacturer: Samsung
• Memory Type: DDR4 SDRAM
• Module Type: LRDIMM (Load Reduced DIMM)
• Capacity: 128GB
• Speed: 2400MHz (PC4-19200)
• CAS Latency: CL19
• Timing: 19-19-19
• Voltage: 1.2V
• Form Factor: 288-Pin DIMM
• Rank: Octa Rank (8Rx4)
• 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 across server clusters
• AI/ML Training Infrastructure: CPU-side memory for large-scale AI/ML training pipelines and data preprocessing at maximum DDR4 capacity
• HPC and Scientific Computing: MPI-based simulation and modeling workloads requiring maximum per-node memory capacity

Compatibility

• Compatible with DDR4 LRDIMM slots only — not compatible with DDR4 RDIMM, UDIMM, DDR5, or DDR3 platforms
• CTC40 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 Octa Rank LRDIMMs and per-channel DIMM limits before ordering

Frequently Asked Questions

What is an Octa Rank LRDIMM and why is it needed for 128GB DDR4?

An Octa Rank LRDIMM contains 8 DRAM ranks on a single module. The LRDIMM memory buffer isolates these ranks from the memory controller, reducing electrical load and enabling stable operation at densities that would be impossible with standard RDIMMs. This architecture is required to achieve 128GB per slot on DDR4 platforms.

What does the CTC40 qualification suffix indicate?

Samsung uses qualification suffixes to denote OEM validation, regional certification, or specific server vendor testing. CTC40 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 or standard DDR4 RDIMM slots?

No — this is a DDR4 LRDIMM and requires a server platform with DDR4 LRDIMM support. It is not compatible with DDR4 RDIMM-only slots, DDR5 platforms, or DDR3 systems. Always verify your server's memory type and DIMM type requirements before ordering.

Whether you are building terabyte-scale virtualization clusters, deploying in-memory database infrastructure, or maximizing per-node memory for AI/ML workloads, the Samsung M393AAK40B41-CTC40 delivers the 128GB DDR4 LRDIMM capacity, ECC protection, and Samsung manufacturing quality your most demanding enterprise server deployments require.