General

Engineer's Note

This is an entry‑level server and workstation memory module, specifically an ECC Unbuffered DDR4 UDIMM designed for platforms requiring data integrity without the complexity of registered memory, making it ideal for small business servers, NAS appliances, and professional compute tasks like financial modeling or light virtualization. Its dual‑rank x8 organization maximizes bank‑level parallelism for higher effective bandwidth, while the integrated ECC actively corrects single‑bit errors to maintain rock‑solid stability during long, uninterrupted operation.

Technical Specs & Insights

1. ECC error correction silently detects and corrects single-bit memory faults, safeguarding transaction integrity in always-on server applications where even a single flipped bit could corrupt financial calculations or hypervisor state.

2. Unbuffered signal path eliminates the register delay found in RDIMMs, offering the lowest command-to-data latency for single-socket workstations that run latency-sensitive engineering simulations.

3. Dual Rank x8 organization interleaves access across two internal rank groups, sustaining near-peak channel bandwidth when multiple virtual machines compete for memory resources under heavy consolidation.

4. A 16 gigabyte module hits the capacity sweet spot for population in four-slot servers, enabling a dense yet affordable 64 GB memory footprint that comfortably supports dozens of medium-weight containers or VMs.

5. DDR4-2666 clocking pushes 21.3 GB/s per channel, a reliable throughput foundation for real-time log aggregation and analytics dashboards that must ingest and process continuous streams of business data without stalling.

Why These Specs Matter

When your infrastructure demands uncompromising data integrity without sacrificing responsiveness, the Samsung M391A2K43DB1-CTD fills a critical role. As an ECC Unbuffered DIMM running at 1.2V with DDR4-2666 speed and CL19 latency, this 16GB dual-rank module is purpose-built for entry‑level servers, small‑business NAS, and professional workstations—platforms where registered memory is either unsupported or overkill, but errors are simply not an option.

Consider a multi‑tenant virtualized environment running a lightweight hypervisor. A single bit flip in memory from background radiation can silently corrupt a guest VM’s kernel, leading to unpredictable crashes or data loss that are notoriously difficult to trace. The on‑die ECC engine corrects these single‑bit errors in real time, giving you a bulletproof foundation for always‑on services like domain controllers or VPN concentrators. In a similar vein, imagine a ZFS‑based file server using in‑RAM deduplication tables and ARC caches. Every bit of metadata integrity directly guards the entire storage pool; ECC scrubbing ensures that a flipped bit in a checksum won’t cascade into corrupted snapshots. The dual‑rank organization further maximizes bandwidth by allowing the memory controller to pipeline access across two internal 64‑bit banks, which keeps transaction rates high during simultaneous user reads and writes. Because these are unbuffered modules, the command‑to‑data latency remains lower than typical registered alternatives, a decisive advantage when you’re running latency‑sensitive databases or compiling large codebases on a workstation that demands both speed and precision. For the engineer specifying memory for a 24/7 operation, this isn’t just a component—it’s the silent guardian of your data’s truth.

Endurance & Reliability

General Virtualization
Deploy this 16GB ECC UDIMM in a balanced quad-channel or dual-channel population to supply reliable memory for moderate VM densities. A set of four identical modules (64 GB total) suits a small virtualization host, offering error-correcting protection for critical workloads without the cost of registered memory. For enhanced headroom, populate all available DIMM slots with matching 16GB modules.

In-Memory Database
Maximise capacity within the platform’s UDIMM limits—typically four 16GB modules for 64 GB—to keep entire datasets resident in protected memory. The ECC capability guards against bit errors that corrupt in-memory structures, and dual-rank construction provides slight latency advantages for large tables. Pair all channels symmetrically so the database engine sees uniform, low-latency access.

High-Performance Computing (HPC)
Install a matched four-module kit to populate all memory channels, enabling full interleaving and maximum bandwidth. The 2666 MT/s speed and dual-rank x8 organisation deliver solid throughput for simulation and modeling. ECC ensures result integrity during long compute runs; avoid mixing capacities or ranks to prevent unbalanced performance.

Verified Compatibility

Rigorously tested server memory compatible with Dell PowerEdge R240, T140, HPE ProLiant DL20 Gen10, and more.

FAQ