General

Engineer's Note

Designed specifically for server platforms demanding high data integrity, this 2 GB DDR2-667 FB-DIMM leverages fully buffered architecture and ECC to ensure robust signal stability and error correction in memory-intensive environments such as virtualization and memory-resident databases. Its dual-rank x8 configuration optimizes bank-level parallelism to sustain throughput under heavy concurrent access workloads.

Technical Specs & Insights

1. ECC protection continuously scans and corrects single-bit errors, preserving data integrity in critical financial transaction logs where even a momentary corruption can trigger auditing failures.
2. The fully buffered architecture serializes command and data paths to an Advanced Memory Buffer, isolating the host controller from electrical loading and enabling massive multi-DIMM configurations required by dense enterprise virtualization nodes.
3. Dual Rank x8 organization interleaves page hits between two internal rank blocks, sustaining high command rates that keep memory pipelines saturated under the random access patterns of multi-tenant cloud workloads.
4. A 2 GB per-module capacity provides sufficient granularity for building cost-effective memory pools in early-generation hypervisor hosts, letting operators scale parity-protected RAM incrementally without overhauling the board layout.
5. The PC2-5300 compliance delivers a steady 5300 MB/s peak bandwidth budget, preventing channel starvation in mid-range SQL servers where read-heavy queries and disk-caching operations compete simultaneously.

Why These Specs Matter

When you are provisioning a virtualization cluster or running an in-memory database, the memory module you choose is not just a component—it is the foundation of your data’s integrity and uptime. The Micron MT18HTF25672FDZ-667H1D6 is a server-class 2GB DDR2-667 Fully Buffered DIMM (FB-DIMM), and its four defining characteristics directly address the real pain points of enterprise environments.

First, the ECC (Error-Correcting Code) functionality is non-negotiable. In a 24/7 virtualized host running multiple VMs, a single bit flip caused by background radiation can silently corrupt a financial transaction or a database index. ECC detects and corrects these errors on the fly, safeguarding your data consistency and preventing costly crashes. Second, the Fully Buffered architecture, unique to server platforms, places an Advanced Memory Buffer (AMB) between the memory controller and the DRAM chips. This serial interface allows you to populate all your server’s memory slots without degrading signal quality, enabling the high-density memory configurations critical for scaling your virtualization cluster without sacrificing stability. Third, the dual-rank x8 organization means the module contains two independent sets of DRAM ranks on the same DIMM. For memory-intensive applications like a Redis cache or SAP HANA, the memory controller can interleave access between ranks, reducing idle latency and boosting throughput so that hot data is served with greater speed. Finally, with a tested speed of 667MHz at CL5, this module delivers steady, predictable synchronous bandwidth, perfectly matching the balance of performance and power efficiency that legacy enterprise servers and workstations demand when consolidating workloads. In deployment, this memory transforms a potentially unstable and slow server into a reliable, high-capacity engine for your critical applications.

Endurance & Reliability

General Virtualization
This FB-DIMM module is designed for legacy server platforms that support DDR2-667 Fully Buffered memory. For general virtualization with moderate VM density, populate at least four identical 2GB modules in a quad-channel configuration to reach 8GB, which provides a balanced mix of capacity and interleaved bandwidth. Always install FB-DIMMs in matched sets per memory riser or branch to comply with the platform's serial architecture and avoid reduced throughput.

In-Memory Database
In-memory databases demand maximum capacity at the lowest latency the platform allows. Given the 2GB density limitation of these DIMMs, you will need to fill all available slots—typically 8 or 16 modules—to reach 16GB or 32GB total, and operate them at the rated CL5 timings. Confirm that the server chipset supports dual-rank x8 FB-DIMMs on all channels under full load, as exceeding electrical limits can force clock throttling and undermine database response times.

High-Performance Computing (HPC)
HPC workloads benefit from the high throughput of Fully Buffered DIMMs' serial links, but capacity per node remains critical. Build a balanced configuration by installing four or eight identical MT18HTF25672FDZ modules per node to achieve 8GB or 16GB, keeping all memory channels symmetrical to maximize streaming bandwidth. Pair this setup with efficient CPU cooling, as the FB-DIMM bridge chips add thermal load that can impact cluster stability during sustained compute runs.

Verified Compatibility

Rigorously tested, this server FB-DIMM is compatible with Dell PowerEdge 2950, 1950, HP ProLiant DL380 G5, and IBM System x3650.

FAQ