General

Engineer's Note

This DDR3-1866 Registered ECC RDIMM with single-rank x4 organization delivers superior signal stability and data integrity for legacy server environments, making it ideal for virtualization and memory-intensive database workloads. Its CL13 low latency and hardware error correction ensure deterministic performance and 24/7 reliability in mission-critical deployments.

Technical Specs & Insights

1. ECC protection detects and corrects single-bit memory errors in real time, guaranteeing data integrity for mission-critical database operations and preventing silent data corruption in always-on server environments.
2. Registered signal buffering stabilizes command and address lines, enabling high-capacity memory configurations without signal degradation, which is vital for scaling virtualization density in multi-socket servers.
3. 1866MHz clock speed delivers high memory throughput, reducing latency for in-memory caching and accelerating simultaneous query processing across virtual machines.
4. Single Rank x4 organization uses x4-wide DRAM components to support advanced memory reliability features like Chipkill, significantly lowering the risk of system failure from multi-bit faults in enterprise workloads.
5. 4GB capacity per DIMM provides a fine-grained building block for memory interleaving, allowing balanced channel population that sustains predictable bandwidth under moderate consolidation ratios.

Why These Specs Matter

The Micron MT18JSF51272PZ-1G9K1KE is a 4GB DDR3-1866 Registered DIMM built for server environments where uptime and data integrity are non‑negotiable. Its four defining characteristics directly address the real‑world pain points of IT infrastructure managers. The ECC engine is your silent guardian against single‑bit memory errors caused by background radiation; in a virtualized cluster running dozens of VMs on one hypervisor, one uncorrected bit flip can crash a production database or corrupt transactional records. Registered signal buffering lets you fully populate memory channels without degrading command‑bus stability, a critical advantage when scaling an in‑memory database like Redis or SAP HANA across multiple DIMMs — you gain capacity without sacrificing reliability under heavy load. Operating at 1866MHz with a CAS latency of 13, this module delivers responsive data access for latency‑sensitive workloads, ensuring that concurrent query execution in a multi‑tenant database farm remains snappy. And because it features a single‑rank x4 organization, it works interoperably with diverse server chipsets while minimizing electrical loading, giving you the flexibility to mix modules in legacy and modern platforms without compromising the memory interleave scheme. For a virtualized data center or a dedicated database node, these four traits translate into fewer outages, smoother peak‑hour performance, and a lower total cost of risk.

Endurance & Reliability

Capacity Planning

This 4GB DDR3-1866 ECC Registered RDIMM is engineered for servers, delivering reliability and data integrity required by enterprise workloads. Proper module quantity and configuration are critical to balance capacity, bandwidth, and cost.

General Virtualization
Virtualized environments depend on ample memory headroom for multiple VMs. With 4GB DIMMs, populate all available channels evenly to maximize interleaving and bandwidth—typically six or eight identical modules per CPU socket. Aim for at least 48GB (12 DIMMs) per host to comfortably run a dozen light-to-medium VMs; scale to 64GB or more for heavier consolidation.

In-Memory Database
In-memory databases demand both high capacity and low latency under ECC protection. Populate every DIMM slot uniformly across all memory controllers to achieve balanced access. A configuration of 16 identical 4GB RDIMMs (64GB total) suits small-to-midsize datasets, while platforms supporting 24 slots can reach 96GB. Keep modules identical to avoid timing penalties.

High-Performance Computing (HPC)
HPC clusters prioritize memory bandwidth per core. Use one DIMM per channel for peak throughput—on a dual-socket server, eight matched 4GB RDIMMs (32GB) deliver optimal transfer rates. If capacity is insufficient for working sets, move to dual-rank or higher-density modules, but avoid mixing, as mismatched ranks degrade performance in tightly coupled parallel jobs.

Verified Compatibility

This server memory has been rigorously tested and is compatible with Dell PowerEdge R720, R620, and HPE ProLiant DL380p Gen8.

FAQ