General

Engineer's Note

This FB-DIMM module is engineered for legacy server platforms where fully buffered architecture maximizes memory scalability and signal integrity in high-density configurations. Its ECC and dual-rank x4 design ensure robust data integrity for mission-critical workloads such as virtualization and in-memory databases, even under sustained operation.

Technical Specs & Insights

1. ECC protection detects and corrects single-bit errors in real time, preserving transactional data integrity for mission-critical enterprise workloads.
2. Fully Buffered architecture decouples the memory bus from the module, enabling massive capacity scaling across numerous DIMM slots without signal degradation.
3. Dual Rank x4 organization interleaves access across internal banks, boosting sustained bandwidth to keep virtual machine memory operations fluid under consolidation.
4. The 2 GB capacity per stick provides a solid building block for cost-effective high-density deployments, allowing larger in-memory caches for database acceleration.
5. The DDR2-667 data rate supplies a reliable throughput ceiling that aligns with legacy server front-side bus speeds, ensuring stable synchronized performance in multi-socket configurations.

Why These Specs Matter

The M395T5750EZ4-CE61 is a 2GB DDR2-667 Fully Buffered DIMM engineered for legacy server platforms where data integrity and continuous uptime are non-negotiable. Its ECC technology goes far beyond basic parity, instantly detecting and correcting single-bit memory errors. In a virtualized cluster, a silent bit flip within a hypervisor can cascade into multiple corrupted VMs and unexpected downtime; this module eliminates that risk at the hardware level. The Fully Buffered architecture employs an Advanced Memory Buffer to isolate the DRAM from the bus, enabling stable population of all memory channels without signal degradation—a critical advantage when scaling main memory for an in-memory database like Redis. There, storing entire transactional datasets in RAM directly determines query throughput and real-time responsiveness. Furthermore, the dual-rank x4 organization intelligently pipelines commands through rank interleaving, so while one rank recharges, the other actively serves data, markedly improving bandwidth efficiency under the heavy parallel access patterns of online transaction processing. With a tight CL5 latency and 667MHz speed, this module delivers predictable, low-latency performance, making it a prudent, risk-mitigating upgrade that faithfully extends the service life of your 24/7 infrastructure.

Endurance & Reliability

The M395T5750EZ4-CE61 is a server FB-DIMM (2GB, DDR2-667, ECC). For capacity planning, consider these workload-specific recommendations.

General Virtualization
Maximize capacity by fully populating all memory channels with identical 2GB FB-DIMMs. Aim for a minimum of 16GB (eight modules) to adequately support multiple VMs. Balance pairs across both memory branches to maintain interleaving and reliable ECC operation.

In-Memory Database
In-memory databases need large, low-latency working sets. Use the maximum number of supported DIMMs—ideally 16 or more—to reach 32GB+ total while relying on ECC and Dual Rank x4 chips for integrity. Configure all channels symmetrically to minimize controller load and avoid throttling under heavy queries.

High-Performance Computing
HPC workloads benefit from memory bandwidth. Populate every FB-DIMM channel with identical 2GB modules for four-channel interleaving; install eight or sixteen units depending on board layout. Match all DIMMs exactly and leverage the Fully Buffered architecture to reduce electrical loading and sustain parallel data streams.

Verified Compatibility

Fully buffered server memory, rigorously tested. Compatible with Dell PowerEdge 2900/2950, HP ProLiant DL380 G5, IBM System x3650.

FAQ