General

Engineer's Note

With ECC and unbuffered UDIMM design, this DDR3-1600 module is tailored for entry-level servers and workstations that require data integrity without the cost of registered memory. Its dual-rank x8 organization and 1600MHz speed deliver reliable throughput for light virtualization and memory-sensitive tasks, while ECC actively corrects single-bit errors to prevent data corruption.

Technical Specs & Insights

1. ECC protection actively detects and corrects single-bit memory errors, safeguarding transactional data integrity in always-on micro-server or NAS environments.
2. Unbuffered architecture eliminates the register latency, giving entry-level server applications faster access to memory for latency-sensitive small-scale virtualization.
3. Dual Rank x8 organization enables rank interleaving, which boosts effective bandwidth and sustains throughput under concurrent light-duty workloads.
4. CL11 CAS latency strikes a balance between response time and clock speed, helping to keep process stalls minimal during repetitive database lookups.
5. Operating at the 1.5V DDR3 standard ensures seamless drop-in compatibility and stable power delivery across a wide range of legacy server boards.

Why These Specs Matter

The Samsung M391B5273DH0-CK0 is a server-grade DDR3 UDIMM engineered for reliability-driven workloads where data integrity is non-negotiable. Its four defining characteristics directly address the real-world pain points of IT administrators managing entry-level servers and small-scale virtualized environments.

First, integrated ECC continuously detects and corrects single-bit memory errors. In a virtualization cluster running multiple VMs on a hypervisor like VMware ESXi, a silent bit-flip caused by background radiation can crash a guest or corrupt cached files—ECC transforms that risk into a seamless correction event, preserving uptime for your business-critical applications. Second, the dual-rank x8 organization interleaves memory accesses across two internal ranks, boosting bandwidth utilization. For an in-memory database such as Redis serving hundreds of concurrent queries, this translates into lower latency and snappier response under load. Third, the unbuffered design eliminates the extra clock cycle of registered modules, offering slightly lower latency that benefits latency-sensitive database lookups. Finally, the DDR3-1600 speed at standard 1.5V delivers stable, predictable performance without exotic power requirements, simplifying thermal management in dense 1U server chassis. Together, these features ensure your file server, lightweight database host, or backup domain controller runs with the consistency that a commercial environment demands.

Endurance & Reliability

General Virtualization
Virtualization hosts demand abundant RAM to run multiple VMs smoothly. Populate every DIMM slot with these 4GB DDR3 ECC UDIMMs to reach at least 32GB (8 modules) or 64GB (16 modules) depending on board capacity. Balance identical modules across all memory channels to avoid bandwidth bottlenecks and ensure stable, responsive guest performance.

In-Memory Database
In-memory databases require low latency and sizable capacity. Install identical dual-rank modules in all channels to enable memory interleaving and maximize throughput. For a single-socket quad-channel server, 8 modules (32GB) fully populate two per channel, delivering both capacity and the parallel access needed for real-time data processing.

High Performance Computing (HPC)
HPC workflows are extremely sensitive to memory bandwidth. Populate memory channels symmetrically with one or two modules per channel—for instance, 4 modules (16GB) on a quad-channel board, or 8 modules (32GB) with a pair per channel. This configuration exploits the full channel width and keeps data streaming to the CPU without stalling compute-bound jobs.

Verified Compatibility

Professionally validated server memory; compatible with Dell PowerEdge T110 II, Lenovo ThinkServer TS140, HP ML310e Gen8.

FAQ