Samsung 16GB 2400MHz DDR4 PC4-19200 ECC Unbuffered CL17 288-Pin DIMM 1.2V Dual Rank Memory – M391A2K43BB1-CRC

Samsung 16GB DDR4 2400MHz ECC Unbuffered Server Memory — M391A2K43BB1-CRC

The Samsung M391A2K43BB1-CRC is a 16GB DDR4 ECC Unbuffered DIMM (UDIMM) server memory module operating at 2400MHz (PC4-19200) with CAS latency CL17 and 1.2V operating voltage. Unlike registered (buffered) modules, UDIMMs connect directly to the memory controller without a register buffer — delivering lower latency and simpler signal paths for workstation and entry-level server platforms that support ECC UDIMMs. 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

• ECC Unbuffered (UDIMM) Design: Direct connection to memory controller delivers lower latency than RDIMMs — ideal for ECC UDIMM-compatible workstations and entry-level servers
• ECC Error Protection: Real-time single-bit error correction ensures data integrity for mission-critical 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: M391A2K43BB1-CRC
• Manufacturer: Samsung
• Memory Type: DDR4 SDRAM
• Module Type: UDIMM ECC (Unbuffered)
• Capacity: 16GB
• Speed: 2400MHz (PC4-19200)
• CAS Latency: CL17
• Timing: 17-17-17
• Voltage: 1.2V
• Form Factor: 288-Pin DIMM
• Rank: Dual Rank (2Rx8)
• Die Organization: x8
• 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

• ECC Workstations: AMD Ryzen Pro, Intel Xeon W, and Intel Core with ECC UDIMM support for professional workstation deployments
• Entry-Level Servers: Tower and rack servers supporting ECC UDIMMs for small business and departmental workloads
• NAS and Storage Servers: FreeNAS/TrueNAS, Unraid, and ZFS-based storage platforms requiring ECC memory for data integrity
• Development and Test Systems: ECC-protected development environments requiring lower latency than RDIMM platforms

Compatibility

• Compatible with DDR4 ECC UDIMM slots only — not compatible with RDIMM, LRDIMM, DDR5, or non-ECC UDIMM slots
• CRC is the base qualification code for this Samsung 16GB DDR4 2400MHz ECC UDIMM series — verify against your platform”s memory QVL before ordering
• Do not mix ECC UDIMMs with RDIMMs or non-ECC UDIMMs in the same system
• Verify your motherboard or server platform explicitly supports ECC UDIMMs before ordering

Frequently Asked Questions

What is the difference between an ECC UDIMM and an RDIMM?

An ECC UDIMM (Unbuffered DIMM) connects directly to the memory controller without a register buffer, offering lower latency but supporting fewer DIMMs per channel than RDIMMs. RDIMMs use a register buffer to support higher DIMM counts and densities. ECC UDIMMs and RDIMMs are not interchangeable.

What does the CRC base qualification code indicate?

CRC is Samsung”s base qualification code for this 16GB DDR4 2400MHz ECC UDIMM series. Variants with extended suffixes (CRCQ, CRC00, CRCQ0) represent specific OEM or regional qualifications — always verify against your platform”s QVL before purchase.

Can this module run at 2133MHz if my platform does not support 2400MHz?

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

Whether you are building an ECC-protected workstation, deploying an entry-level server, or expanding a ZFS-based NAS, the Samsung M391A2K43BB1-CRC delivers the 16GB DDR4 ECC UDIMM reliability, error protection, and Samsung manufacturing quality your platform demands.