General

Engineer's Note

Deployed in legacy server platforms, this FB-DIMM provides ECC and fully buffered signal integrity for mission-critical memory-database and virtualization workloads. Its dual-rank x8 organization and CL5 latency enhance bank-level parallelism, ensuring stable data access under sustained heavy loads.

Technical Specs & Insights

1. ECC protection corrects transient memory errors on the fly, preventing silent data corruption that could compromise financial transactions or virtualization integrity in always-on servers.

2. Fully Buffered architecture decouples the memory controller from DRAM loads, enabling massive DIMM counts per channel without signal decay, ideal for memory-hungry database farms.

3. Dual Rank x8 organization leverages rank interleaving to pipeline commands across internal banks, sustaining throughput when multiple virtual machines compete for memory access.

4. 667 MHz clock speed translates to 5.3 GB/s of theoretical bandwidth per channel, sufficient to keep older enterprise workloads like web serving and light containerized services running smoothly.

5. CL5 low-latency column access reduces initial data retrieval delay, sharpening response times under the heavy concurrent request patterns typical of multi-tenant server environments.

Why These Specs Matter

The MT18HTF25672FDY-667E1N6 is a server-grade Fully Buffered DIMM engineered for data centers where uptime and accuracy are non-negotiable. Its ECC technology actively detects and corrects single-bit memory errors, a critical defense against silent data corruption that can crash a virtualization cluster or silently poison financial records in an in-memory database. The Fully Buffered architecture utilizes an Advanced Memory Buffer to decouple the memory controller from the DRAM, enabling you to populate all channels with high-density modules without signal degradation. This means your hypervisor can confidently support dozens of virtual machines with a larger, stable memory pool. Furthermore, the dual-rank x8 organization significantly boosts bandwidth through rank interleaving; while one rank is refreshing, the controller reads from the other, delivering near-continuous data flow for latency-sensitive workloads like a busy Redis or SAP HANA instance. For your virtualized infrastructure or database server, this module translates directly into hardened reliability, higher consolidation ratios, and faster query throughput under constant load.

Endurance & Reliability

General Virtualization
For a DDR2-based server using FB-DIMMs, populate all memory channels evenly to maximize throughput. A typical light virtualization host would require at least 8 identical 2GB modules (16GB total) to run multiple virtual machines, filling both branches of the memory controller for balanced interleaving. Always install modules in matched pairs per channel to maintain Fully Buffered integrity.

In-Memory Database
In-memory databases demand maximum capacity and error correction. Populate every available FB-DIMM slot with these 2GB ECC modules to reach the server’s highest supported capacity, such as 16 or 32 modules for 32GB or 64GB total. The registered ECC and buffered design ensure data reliability, while dual-rank modules help mitigate performance penalties when all slots are occupied.

High Performance Computing
HPC configurations require symmetric memory layout for peak bandwidth. Use four or eight 2GB FB-DIMMs per computing node, populating all memory channels identically. The buffered design delivers deterministic latency, making capacity per node more critical than clock speed for many parallel workloads.

Verified Compatibility

Rigorously tested for compatibility: Dell PowerEdge 2950, HP ProLiant DL380 G5, IBM System x3650.

FAQ