Samsung 64GB DDR4 2666MHz ECC Registered Server Memory — M393A8K40B22-CWD6Q

The Samsung M393A8K40B22-CWD6Q is a 64GB DDR4 ECC Registered (RDIMM) server memory module operating at 2666MHz (PC4-21300) with CAS latency CL19 and 1.2V operating voltage. This high-density 64GB Quad Rank x4 module delivers maximum DDR4 memory capacity per slot for memory-intensive enterprise workloads including large-scale virtualization, in-memory databases, 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 DDR4: High capacity per slot for memory-intensive enterprise workloads — maximize total system memory on DDR4 platforms
• ECC Error Protection: Real-time single-bit error correction ensures data integrity for mission-critical server workloads
• Registered (Buffered) Design: Enables stable, high-density multi-DIMM server configurations without signal degradation
• 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: M393A8K40B22-CWD6Q
• Manufacturer: Samsung
• Memory Type: DDR4 SDRAM
• Module Type: RDIMM (Registered / Buffered)
• 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

• Large-Scale Virtualization: VMware vSphere, Microsoft Hyper-V, and KVM deployments requiring maximum memory capacity per DDR4 server
• In-Memory Databases: MySQL, PostgreSQL, Microsoft SQL Server, and Oracle database workloads requiring large memory pools
• General-Purpose HPC: Scientific computing and simulation workloads requiring high per-node memory capacity on DDR4 platforms
• High-Density Infrastructure: Memory expansion for existing DDR4 server deployments requiring maximum capacity per slot

Compatibility

• Compatible with DDR4 RDIMM slots supporting Quad Rank modules — verify your platform's Quad Rank DIMM support before ordering
• CWD6Q suffix denotes specific OEM or regional server vendor qualification — verify against your server's memory QVL before ordering
• Do not mix with DDR4 UDIMMs or LRDIMMs in the same system
• For multi-DIMM stability, populate channels with matched capacity, speed, and rank modules

Frequently Asked Questions

Is this module compatible with DDR5 servers?

No — DDR4 and DDR5 are not interchangeable. DDR4 RDIMMs require DDR4-compatible server platforms. Always verify your server's memory type requirement before ordering.

What does the CWD6Q qualification suffix indicate?

Samsung uses qualification suffixes to denote OEM validation, regional certification, or specific server vendor testing. CWD6Q identifies this module's exact qualification tier — always cross-reference with your server vendor's memory compatibility or QVL list before purchase.

What should I verify before ordering a Quad Rank DIMM?

Some server platforms limit the number of Quad Rank DIMMs per channel due to increased electrical load. Always verify your server's Quad Rank DIMM support and per-channel limits in the QVL 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 M393A8K40B22-CWD6Q delivers the 64GB DDR4 2666MHz capacity, ECC protection, and Samsung manufacturing quality your enterprise server environment demands.