General

Engineer's Note

This DDR2-667 FB-DIMM with ECC is tailored for legacy server and workstation platforms that demand robust data integrity and high memory scalability. Its fully buffered architecture and dual-rank x8 organization enable stable operation across fully populated memory channels, while ECC protection is critical for mission‑critical workloads such as virtualization and in‑memory databases.

Technical Specs & Insights

1. ECC error correction actively detects and corrects single-bit memory faults, preserving data integrity for mission-critical server applications like financial ledgers and user authentication databases.
2. Fully Buffered architecture serializes communication to a dedicated buffer chip, enabling extensive memory scalability while maintaining signal stability across densely populated rack servers.
3. Dual Rank x8 interleaving maximizes channel bandwidth utilization, delivering steady throughput for simultaneous virtual machine and container workloads under heavy consolidation.
4. CL5 column access latency reduces the delay between memory request and retrieval, sharpening transaction processing speeds for latency-sensitive caching and database servers.
5. DDR2-667 frequency class provides a balanced bandwidth foundation, ensuring consistent data delivery without thermal spikes in always-on enterprise environments.

Why These Specs Matter

The Samsung M395T5663QZ4-CE66 is a server‑grade 2 GB DDR2‑667 FB‑DIMM engineered for relentless data‑center duties. Its integrated ECC engine continuously detects and corrects single‑bit errors, preventing silent data corruption that could crash a virtualized host running dozens of VMs or poison a financial transaction inside an in‑memory database. The Fully Buffered architecture serializes command and data streams through an advanced memory buffer, so you can populate every DIMM slot in a quad‑socket server without signal degradation—essential for dense virtualization clusters that demand huge, stable memory footprints. The dual‑rank x8 organization interleaves accesses across two independent ranks on the module, boosting effective bandwidth and concurrency. In a high‑concurrency database like Redis or an enterprise analytical workload, that directly translates to faster query execution and consistently low latency under parallel load. Finally, the standardized 1.8 V operating voltage and CL5 latency deliver an ideal balance of thermal stability and fast timing, safeguarding 24/7 reliability in tightly packed racks where every watt and microsecond directly impacts service uptime.

Endurance & Reliability

This 2GB ECC FB-DIMM is server memory. Planning guide:

General Virtualization
Populate channels symmetrically for ECC reliability. With these 2GB modules, an 8-slot dual-socket server provides 16GB for light virtualization. For heavier loads, fill all 16 slots to reach 32GB, leveraging the fully buffered design for stable multi-VM operation.

In-Memory Database
Maximise capacity and data integrity using all FB-DIMM slots—up to 32 modules for 64GB on a quad-channel server—to keep databases in RAM. Use identical dual-rank x8 DIMMs across all channels to ensure uniform latency and avoid bottlenecks. Fully Buffered architecture handles large populations well, but populate in rank-matched kits for consistent performance.

High-Performance Computing (HPC)
Deploy equal DIMM counts per channel for maximum bandwidth—typically 4 modules per channel in a quad-channel system yields 8GB with interleaving. Build uniform nodes with these FB-DIMMs to ensure consistent MPI performance across the cluster. Standardize on this module across all nodes to simplify memory mapping and reduce jitter.

Verified Compatibility

Rigorously tested, compatible servers: Dell PowerEdge 2950, HP ProLiant DL380 G5, IBM System x3650.

FAQ