Micron MT18KSF51272PDZ-1G4D 4GB DDR3 RDIMM 1333 | Registered ECC RAM

General

Engineer's Note

This is a server-class DDR3-1333 RDIMM engineered with ECC and a registered signal type for maximum data integrity in legacy virtualization hosts and in-memory database servers. The dual-rank design at 1.35V low voltage increases memory density and power efficiency, while the CL9 latency maintains responsive, stable operation under sustained enterprise workloads.

Technical Specs & Insights

1. ECC detection and correction safeguards transactional data integrity, ensuring that financial or database workloads never encounter silent memory errors that could corrupt critical records.
2. Registered signaling buffers the command and address buses, allowing servers to populate all DIMM slots without signal degradation under heavy memory controller loads.
3. The DDR3-1333 speed floor provides a stable balance between transfer rate and power draw, matching the needs of dense rack servers that prioritize consistent I/O over peak frequencies.
4. Operating at 1.35V reduces the thermal footprint inside tightly packed server chassis, helping maintain air-cooled temperature margins and lowering fan power consumption.
5. Dual Rank interleaving enables parallel access across rank pairs, boosting effective bandwidth for virtualized environments where multiple VMs compete for memory resources simultaneously.

Why These Specs Matter

Designed as a server-grade RDIMM, the Micron MT18KSF51272PDZ-1G4D serves in environments where failure is not an option. Its four defining characteristics translate directly into infrastructure resilience. The ECC technology continuously detects and corrects single-bit memory errors—silent data corruption that, in a virtualization cluster running dozens of VMs, could cascade into hypervisor crashes or data inconsistency across your entire private cloud. The registered signal buffering is what makes this stability scalable: it isolates the memory controller from the electrical load of the DRAM chips, allowing you to populate all channels densely for large-memory applications without signal degradation. That capacity, combined with the module’s dual‑rank design, interleaves access across two internal ranks to maximize bandwidth during sustained I/O. In an in‑memory database such as SAP HANA or Redis, this architecture keeps query latency predictable under heavy concurrent reads and writes. Finally, the 1.35V low‑voltage operation is far from a minor spec. Across a fully loaded rack, it measurably reduces power draw and cooling overhead, lowering your total cost of ownership while preserving the thermal headroom essential for 24/7 datacenter reliability.

Endurance & Reliability

General Virtualization
For light to moderate virtualization hosts, populate at least four of these 4 GB RDIMMs to reach 16 GB total, using a balanced interleaved configuration across memory channels. The ECC and registered features ensure stability for several concurrent virtual machines, and the 1.35 V low voltage helps reduce overall power and cooling costs in density-optimized servers. Avoid mixing with non-ECC modules—plan for identical dual-rank DIMMs in every populated slot to preserve correctable error coverage.

In-Memory Database
In-memory databases demand capacity and low latency, so deploy these 4 GB modules in a fully populated multi-channel setup (e.g., twelve DIMMs for 48 GB) to maximize bandwidth and support large working sets. The registered DIMM design permits higher module counts without sacrificing signal integrity, while ECC corrects single-bit errors that could otherwise corrupt critical data. When capacity exceeds what a single 4 GB DIMM provides, use identical dual-rank DIMMs per channel and consider faster, same-generation replacements only if your workload outgrows the DDR3-1333 ceiling.

High-Performance Computing
HPC clusters benefit from the reliability of registered ECC memory; configure each node with matched sets of 4 GB DIMMs across all available channels to sustain aggregated throughput. For burst-buffer or scratch-data nodes, populate six or eight modules (24–32 GB) to balance capacity and bandwidth. The low 1.35 V operating voltage cuts thermal output in dense rack environments, allowing sustained full-load operation while maintaining the error protection essential for long-running scientific computations.

Verified Compatibility

Strictly tested server memory, compatible with Dell R620, HP DL360p Gen8, IBM x3650 M4, and more.

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