General

Engineer's Note

This VLP RDIMM with ECC and registered signal buffering is ideal for virtualization and in-memory database workloads in space-constrained rack servers, where data integrity under high-density deployments is critical. Its dual-rank x8 organization and DDR3-1600 speed deliver robust memory bandwidth and sustained performance, while the very low-profile form factor improves airflow and thermal clearance in 1U and blade enclosures.

Technical Specs & Insights

1. ECC protection silently corrects single-bit memory errors, preserving data integrity across long-running enterprise workloads like virtualization hosts and transactional databases.
2. Registered buffering stabilizes command and address signals across high-density memory banks, allowing seamless scaling of RAM capacity in multi-socket server platforms.
3. The very low-profile design reduces airflow obstruction in tight rack-mount enclosures, helping maintain lower server operating temperatures and consistent performance.
4. Dual Rank x8 organization interleaves memory accesses for sustained channel efficiency, which directly benefits the responsiveness of consolidated virtual machines under mixed I/O load.
5. DDR3 speed delivers ample memory bandwidth for mid-range enterprise applications, enabling smooth execution of concurrent data processing tasks without bottlenecking the CPU.

Why These Specs Matter

When you are running a virtualization cluster or an in-memory database, the choice of memory directly impacts uptime, data integrity, and performance. The Micron MT18JDF51272PDZ-1G6 is a server-grade 4 GB DDR3-1600 VLP RDIMM, and its four defining characteristics are engineered precisely for these environments. First, ECC continuously detects and corrects single-bit errors, meaning a stray cosmic particle or electrical noise will not silently corrupt a financial transaction or a virtual machine’s state. Second, its Registered signal buffering stabilizes the command and address buses when populating all 24 DIMM slots on a server board; for your dense VMware or Hyper-V host, this directly translates into the ability to scale to hundreds of virtual machines without mysterious crashes. Third, the dual-rank x8 organization enables rank interleaving, so while one rank is refreshing or waiting on a cache miss, the memory controller can immediately service reads from the other rank, lowering effective latency and sustaining throughput for Redis or SAP HANA. Finally, the Very Low Profile form factor fits into 1U blade servers and half-height chassis where airflow is precious, keeping thermals in check so your data center stays green and reliable.

Endurance & Reliability

This module is a server-class DDR3-1600 ECC Registered VLP RDIMM, purpose‑built for dense rack deployments. Use the following capacity planning guidance for common server workloads.

General Virtualization
Populate all memory channels symmetrically with identical 4GB modules to maximize capacity and guarantee stable VM density. In a dual‑socket server with 12 DIMM slots per processor, install two modules per channel for a balanced 48GB per CPU (96GB total). Enable node interleaving so each virtual machine sees consistent, low‑latency access.

In‑Memory Database
Fill every available slot with these dual‑rank 4GB RDIMMs to extract maximum capacity—three modules per channel in an 8‑channel system deliver 96GB. For small‑ to mid‑size datasets this creates a reliable caching tier; larger footprints should scale horizontally with identical configurations or supplement with higher‑capacity 8GB/16GB Registered DIMMs in the same family.

High‑Performance Computing (HPC)
Install one or two 4GB modules per memory channel across all sockets to eliminate NUMA imbalances and sustain peak bandwidth. A 16‑channel dual‑socket box fully populated with 32 modules supplies 128GB, and the dual‑rank x8 organization preserves the full 1600 MT/s rate. The VLP form factor further simplifies airflow in 1U nodes, making it ideal for compute‑bound CFD or simulation clusters.

Verified Compatibility

Server memory rigorously tested for Dell PowerEdge R720, R620, HP DL380p Gen8, and more.

FAQ