General

Engineer's Note

This 16GB DDR4-2666 ECC Unbuffered UDIMM is specifically engineered for entry-level servers and workstations that demand data integrity without the cost of registered memory. Its unbuffered ECC design provides single-bit error correction for critical applications like file servers or light virtualization workloads, while the dual-rank x8 organization enhances interleaving to improve memory bandwidth efficiency at the conservative CL19 latency.

Technical Specs & Insights

1. Error Correcting Code (ECC) capability automatically detects and corrects single-bit memory faults, preserving transactional integrity for mission-critical small business databases and virtualization hosts that cannot tolerate silent data corruption.
2. Unbuffered signal type eliminates the register clock delay found in registered DIMMs, delivering marginally lower latency that benefits single-socket entry server responsiveness in latency-sensitive edge computing roles.
3. 16 GB capacity per module provides sufficient density to host multiple lightweight virtual machines or containers on a compact micro-ATX server board while leaving room for future memory expansion.
4. DDR4-2666 data rate supplies a balanced 21.3 GB/s per-channel throughput, efficiently handling concurrent file-sharing requests and remote desktop sessions without creating a thermal burden inside constrained chassis.
5. Dual Rank x8 organization interleaves two internal rank groups per module, sustaining higher command bus utilization and steady bandwidth delivery for hypervisor workloads that demand consistent VM memory performance.

Why These Specs Matter

The Samsung M391A2K43BB1-CTD is a 16GB DDR4 UDIMM purpose-built for professional workstations, integrating ECC error correction, unbuffered low-latency signaling, a dual-rank x8 architecture, and a cool 1.2V profile. During overnight finite-element analysis or back-testing trading strategies, ECC silently detects and corrects single-bit errors triggered by cosmic radiation, ensuring a corrupted cell never forces you to re-run an eight-hour job. The unbuffered design speaks directly to the memory controller, shaving off the clock cycle penalty of registered modules — so your CAE solver or 3D viewport stays responsive under heavy multithreading. Dual-rank x8 bank interleaving then elevates effective bandwidth, absorbing the massive data streams of 4K video grading or BIM model rendering without frame drops. All within a 1.2V envelope that reduces thermal strain during round-the-clock operation, preserving stability and hardware longevity. For professionals who equate uptime with revenue, this memory converts technical robustness into real-world productivity.

Endurance & Reliability

Identified as server memory: 16GB DDR4-2666 CL19 ECC Unbuffered UDIMM (dual‑rank, 288‑pin). Capacity planning guidelines for common server workloads:

General Virtualization
For moderate VM density, deploy two 16GB modules (32GB) in a dual‑channel configuration to combine cost‑efficiency with ECC protection, comfortably supporting 5–8 typical virtual machines. For heavier workloads, populate all four DIMM slots with identical dual‑rank modules to reach 64GB, leveraging interleaving for better bandwidth.

In‑Memory Database
In‑memory databases require maximum capacity and reliability. Fill all memory channels symmetrically with four 16GB ECC UDIMMs (64GB) to eliminate bottlenecks; the dual‑rank x8 organization aids interleaving for better performance. Always respect unbuffered ECC limitations to maintain stability under sustained loads.

High‑Performance Computing
For bandwidth‑sensitive HPC, adopt a one‑DIMM‑per‑channel (1DPC) approach: install one dual‑rank 16GB module per channel (32GB total) to sustain the full 2666MT/s and lowest CL19 latency, guaranteeing maximum throughput. Avoid populating two DIMMs per channel, as unbuffered ECC memory often down‑clocks when fully loaded, sacrificing performance and increasing latency.

In every scenario, populate DIMMs in matched pairs to preserve ECC and dual‑channel interleaving.

Verified Compatibility

Validated for ECC UDIMM servers: rigorously tested, compatible with Dell PowerEdge T140, Lenovo ThinkSystem ST50, HPE ProLiant ML30 Gen10.

FAQ