General

Engineer's Note

Designed as a DDR4-2400 UDIMM with ECC, this module is ideal for entry-level servers and small business NAS systems where data integrity is paramount. Its dual-rank x8 configuration enhances memory bandwidth efficiency, while the ECC engine and unbuffered signal type ensure reliable error correction and stable operation under continuous workloads.

Technical Specs & Insights

1. ECC error detection and correction eliminates single-bit memory faults silently, preserving data integrity for always-on server workloads like database hosting and financial transaction processing.
2. Dual Rank x8 organization interleaves internal banks to sustain high bandwidth utilization, critical for maintaining predictable virtual machine performance under heavy consolidation.
3. 16GB capacity per UDIMM delivers ample headroom for memory-hungry virtualization hosts, enabling a higher density of guest instances without swapping to slower storage.
4. DDR4-2400 data rate offers an optimal balance of throughput and power efficiency, accelerating in-memory caching and real-time analytics without excessive energy draw.
5. 1.2V ultra-low operating voltage minimizes power consumption and cooling demand across rack-scale deployments, directly lowering operational costs and improving long-term component reliability.

Why These Specs Matter

Designed for servers and workstations where data integrity is non-negotiable, the Samsung M391A2K43BB1-CRC is a 16GB DDR4-2400 ECC Unbuffered DIMM. Its four key attributes directly address real-world pain points in critical environments.

The unbuffered architecture eliminates the extra clock cycle of registered memory, reducing latency for latency-sensitive workloads like in-memory databases. When Redis or Memcached processes thousands of queries per second, the direct signal path ensures snappier response times and consistent transaction throughput. ECC protection is a silent safeguard you cannot afford to ignore: a single-bit flip caused by background radiation can corrupt a virtualized finance application or silently alter database records. With hardware error correction, that bit is detected and fixed on the fly, preventing crashes and silent data corruption across your entire VM fleet. The dual-rank x8 organization groups memory chips into two independently accessible ranks, enabling rank interleaving that boosts bandwidth. In a virtualized cluster running multiple VMs, this means the hypervisor can service several memory requests simultaneously, reducing contention and keeping responsiveness stable under load. Finally, the 1.2V operating voltage directly lowers power consumption and heat output, which compounds across a rack full of servers to slash cooling costs and improve long-term reliability. For IT teams managing virtual storage appliances, small business servers, or compute nodes that must run 24/7, this UDIMM translates to fewer support tickets, protected data, and a more predictable performance baseline—exactly what matters when uptime is your business.

Endurance & Reliability

General Virtualization
With a 16 GB DDR4-2400 ECC UDIMM, build a balanced hypervisor host by populating all available channels — typically four modules for 64 GB total. This satisfies moderate VM density while ECC guards against in-memory errors that could corrupt multiple guests. Avoid single-module setups; dual-channel operation and headroom for memory overcommit are essential.

In-Memory Database
Maximize socket capacity by installing a full set of identical 16 GB UDIMMs, ordinarily four modules for 64 GB. This size keeps frequently queried datasets in RAM, drastically reducing storage I/O. ECC is non-negotiable here — it protects against silent data corruption that can corrupt financial or transactional records. Pair with a low-latency CPU to exploit the unbuffered memory’s faster access path.

High-Performance Computing (HPC)
Populate one DIMM per channel to achieve the peak bandwidth of the platform — for a common quad-channel server that means four 16 GB UDIMMs yielding 64 GB with full interleaving. The unbuffered design gives a slight latency edge over registered memory, beneficial for tightly coupled parallel workloads. For memory-bound simulations, consider future scaling to 128 GB if the board supports it, but always maintain symmetric channel filling to avoid bandwidth penalties.

Verified Compatibility

Rigorously tested server UDIMM, compatible with Dell PowerEdge T140, HPE ML30 Gen10, Lenovo ST250.

FAQ