General

Engineer's Note

This FB-DIMM module is engineered for legacy server platforms, where its Fully Buffered architecture and ECC support deliver reliable data integrity under demanding memory-intensive workloads such as database servers and virtualization hosts. The dual-rank x4 organization and CL5 latency ensure stable, high-density memory configurations while mitigating signal loading issues in multi-DIMM channels.

Technical Specs & Insights

1. ECC error correction tirelessly detects and remedies single-bit memory faults, delivering the unwavering data integrity demanded by transactional databases and financial processing platforms.
2. Fully Buffered signaling isolates the memory bus from system loading, enabling dense, high-capacity configurations critical for large-scale virtualization hosts without compromising signal quality.
3. Dual Rank x4 organization maximizes bank-level parallelism, sustaining high command rates under concurrent virtual machine I/O streams and multi-tenant application pressure.
4. The 2 GB per module capacity provides a cost-effective memory footprint for mid-range consolidation, allowing more active virtual machines per physical node without excessive power draw.
5. PC2-5300 throughput establishes a reliable 5.3 GB/s channel bandwidth, keeping pace with caching layers and in-memory databases to reduce data fetch latency under sustained load.

Why These Specs Matter

The Samsung M395T5750CZ4-CE65 is a server-grade Fully Buffered DDR2-667 FB-DIMM, engineered explicitly for mission-critical enterprise environments where data integrity and uptime are non-negotiable. Its ECC capability is your frontline defense against silent data corruption. In a high-density virtualization cluster running dozens of VMs on a single host, a single bit flip in memory caused by background radiation can crash an entire application silently. ECC detects and corrects these errors in real time, directly translating to uninterrupted business continuity and preventing costly database rollbacks.

The Fully Buffered architecture replaces the parallel stub bus with a point-to-point serial interface via an Advanced Memory Buffer. For an in-memory database like Redis or SAP HANA handling millions of transactions per second, this means you can populate all 240 pins across multiple channels with high-capacity DIMMs without signal degradation, achieving the enormous memory footprint that a fast-growing dataset demands.

The Dual Rank x4 organization further amplifies real-world performance under pressure. While a single-rank module would force the memory controller to wait, dual ranks enable rank interleaving—you can read from one rank while simultaneously preparing the next command on the other. In a heavy OLTP scenario, this pipelining slashes effective latency well below the CL5 timing, sustaining throughput when thousands of concurrent queries hit the buffer pool. Together, these features ensure your server infrastructure delivers predictable, resilient performance exactly when it counts most.

Endurance & Reliability

General Virtualization
For general virtualization on a dual-socket FB-DIMM server, install at least eight of these 2GB modules (16GB total) evenly across both memory branches to enable quad-channel interleaving and balanced NUMA access. This provides sufficient capacity for several lightweight VMs while ECC protection guards against data corruption. Always populate matched pairs in each channel to maintain optimal rank interleaving.

In-Memory Database
In-memory database workloads demand maximum capacity and absolute reliability. Fill every available FB-DIMM slot with these 2GB ECC modules—on a typical 16-slot board that yields 32GB—to keep working sets fully resident in RAM. Activate memory mirroring or sparing in the BIOS to protect against uncorrectable errors that could otherwise crash the database.

High-Performance Computing (HPC)
Memory bandwidth is critical for HPC. Populate all four FB-DIMM channels per processor with identical dual-rank x4 modules, typically a total of sixteen modules (32GB) for a dual-socket node. This configuration achieves the highest possible channel interleaving throughput for parallel simulations. Although the DDR2-667 speed is modest, the fully-buffered architecture guarantees stable, error-corrected data streams.

Verified Compatibility

Rigorously tested for FB‑DIMM systems; compatible with Dell PowerEdge 2950, HP ProLiant DL380 G5, IBM System x3650.

FAQ