Samsung 64GB 2666MHz DDR4 PC4-21300 ECC Registered CL19 288-Pin DIMM 1.2V Dual Rank x4 Memory Module — M393A8G40MB2-CTD

The Samsung M393A8G40MB2-CTD is a 64GB DDR4-2666MHz ECC Registered (RDIMM) server memory module operating at 1.2V with CL19 latency. Featuring a 288-pin interface and Dual Rank x4 configuration, it delivers enterprise-grade ECC error correction and high-capacity memory for multi-processor server platforms requiring registered buffering for stability in dense memory configurations.

Key Features

• 64GB high-capacity ECC Registered DIMM for enterprise servers
• DDR4-2666MHz (PC4-21300) for reliable server memory performance
• Registered DIMM (RDIMM) for stability in multi-DIMM server configurations
• Dual Rank x4 configuration for high-density memory deployment
• 1.2V low-voltage operation for energy-efficient server operation
• 288-pin interface — standard DDR4 RDIMM form factor

Product Specifications

• Part Number: M393A8G40MB2-CTD
• Manufacturer: Samsung
• Model: 64GB DDR4-2666 ECC Registered DIMM
• OEM Status: Genuine Samsung OEM
• Capacity: 64GB
• Type: DDR4 ECC Registered DIMM (RDIMM)
• Speed: 2666MHz (PC4-21300)
• CAS Latency: CL19
• Voltage: 1.2V
• Rank / Organization: Dual Rank x4
• Pins: 288-Pin
• ECC: Yes

Memory Specifications

• Capacity: 64GB
• DIMM Type: Registered ECC (RDIMM)
• DDR Generation: DDR4
• Pin Count: 288-Pin
• Rank: Dual Rank (2Rx4)
• Voltage: 1.2V
• ECC: Yes (Error-Correcting Code)
• Register Buffer: Yes (registered for signal integrity)

Performance Specifications

• Speed: DDR4-2666MHz
• Bandwidth: PC4-21300
• CAS Latency: CL19
• XMP / JEDEC: JEDEC standard

Use Cases

• High-capacity enterprise server memory for dual and quad-socket platforms
• Virtualization hosts requiring large memory pools (VMware, Hyper-V)
• Database servers and in-memory computing workloads
• HPC and scientific computing requiring large ECC RDIMM capacity

Compatibility

• Compatible with servers supporting DDR4 ECC Registered (RDIMM) memory
• Not compatible with systems requiring UDIMM or LRDIMM
• Compatible with Intel Xeon Scalable and AMD EPYC server platforms
• Verify server QVL (Qualified Vendor List) before ordering

Frequently Asked Questions

What is the difference between RDIMM and UDIMM?

RDIMM (Registered DIMM) includes a register buffer between the memory chips and the memory controller, improving signal integrity and allowing more DIMMs per channel — essential for enterprise servers. UDIMM connects directly to the controller and is used in workstations and entry-level servers.

Is the M393A8G40MB2-CTD compatible with Intel Xeon Scalable processors?

Yes, the M393A8G40MB2-CTD is compatible with Intel Xeon Scalable server platforms supporting DDR4-2666 ECC RDIMM memory. Verify your specific server's QVL before ordering.

Can I mix 64GB RDIMMs with other capacity RDIMMs?

Mixing DIMM capacities is generally supported but may affect performance and memory interleaving. Consult your server documentation for mixed-capacity RDIMM configuration guidelines.

The Samsung M393A8G40MB2-CTD 64GB DDR4-2666 ECC Registered DIMM delivers high-capacity, enterprise-grade memory performance for demanding server workloads. Order today for genuine Samsung RDIMM quality with proven ECC reliability.