Samsung 32GB 2666MHz DDR4 PC4-21300 ECC Registered CL19 288-Pin DIMM 1.2V Dual Rank x4 Memory Module – M393A4K40CB2-CTD

Samsung 32GB DDR4 2666MHz ECC Registered Server Memory — M393A4K40CB2-CTD

The Samsung M393A4K40CB2-CTD is a 32GB DDR4 ECC Registered (RDIMM) server memory module operating at 2666MHz (PC4-21300) with CAS latency CL19 and 1.2V operating voltage. A proven workhorse of enterprise server infrastructure, this module delivers reliable memory bandwidth and capacity for a wide range of server workloads including virtualization, databases, and general-purpose 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

• Proven DDR4 Reliability: Mature, widely-supported DDR4 platform with broad server compatibility across HPE, Dell, Supermicro, and Lenovo 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: M393A4K40CB2-CTD
• Manufacturer: Samsung
• Memory Type: DDR4 SDRAM
• Module Type: RDIMM (Registered / Buffered)
• Capacity: 32GB
• Speed: 2666MHz (PC4-21300)
• CAS Latency: CL19
• Timing: 19-19-19
• Voltage: 1.2V
• 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

• Virtualization: VMware vSphere, Microsoft Hyper-V, and KVM deployments on DDR4 server platforms
• Database Servers: MySQL, PostgreSQL, Microsoft SQL Server, and Oracle database workloads requiring reliable ECC memory
• General-Purpose Computing: Enterprise application servers, file servers, and web servers requiring stable, high-capacity memory
• Legacy Infrastructure Expansion: Cost-effective memory expansion for existing DDR4 server deployments

Compatibility

• Compatible with DDR4 RDIMM slots only — not compatible with DDR5 platforms
• CTD is the base qualification code for this Samsung 32GB DDR4 2666MHz CB2 x4 RDIMM series — 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 CTD base qualification code indicate?

CTD is Samsung”s base qualification code for this 32GB DDR4 2666MHz CB2 RDIMM series. Variants with extended suffixes (CTD7Q, CTD6Q, CTD8Q, CTD6Y, CTD7Y) represent specific OEM or regional qualifications — always verify against your server vendor”s QVL before purchase.

Can this module run at 2400MHz or 2133MHz if my server does not support 2666MHz?

DDR4 modules are backward speed-compatible — if your server platform does not support 2666MHz, the module will train down to the platform”s maximum supported speed (e.g., 2400MHz or 2133MHz). Always verify with your server vendor”s QVL to confirm supported configurations.

Whether you are expanding memory in an existing DDR4 server infrastructure, deploying new virtualization hosts, or scaling database server capacity, the Samsung M393A4K40CB2-CTD delivers the proven DDR4 reliability, ECC protection, and Samsung manufacturing quality your enterprise server environment demands.