General

Engineer's Note

This Fully Buffered DDR2-667 FB-DIMM with ECC is designed for legacy server platforms, providing critical data integrity for memory-intensive workloads such as virtualization and small-scale database servers. Its Fully Buffered architecture and dual-rank x4 configuration ensure stable signal distribution and reliable bandwidth under heavy load, while the CL5 latency offers responsive access for aging yet mission-critical systems.

Technical Specs & Insights

1. Fully Buffered DIMM architecture serializes command and data paths to drastically reduce electrical loading, enabling high-capacity memory configurations that maintain signal integrity in dense server racks.
2. ECC protection autonomously detects and corrects single-bit errors, safeguarding transactional databases and financial processing against silent data corruption.
3. The fully buffered interface isolates the memory bus from the host controller, allowing multiple ranks to operate simultaneously and preserving bandwidth under heavy multi-tenant workloads.
4. Dual Rank organization with narrow DRAM width fills all memory channels efficiently, boosting throughput for virtualized infrastructure where many VMs compete for I/O.
5. A modest capacity footprint matches the needs of light-duty application servers and edge appliances, delivering dependable performance while keeping power and acquisition costs in check.

Why These Specs Matter

The M395T5160QZ4-CE68 is a server-grade FB-DIMM engineered for legacy enterprise platforms that demand unwavering data integrity and scalable memory capacity. In a virtualization cluster running multiple guest machines, a single uncorrected bit flip can cascade into application crashes or corrupt transactional records. The on-board ECC constantly detects and corrects such errors in real time, directly shielding your databases and hypervisors from silent data corruption that leads to costly downtime. Equipped with a Fully Buffered architecture, the module routes traffic through an Advanced Memory Buffer instead of loading the memory bus directly. This serial interface dramatically improves signal cleanliness, letting you populate all 240-pin sockets without sacrificing stability—essential when scaling a memory-hungry in-memory database like Redis or SAP HANA on older dual-socket servers. The dual-rank x4 organization boosts throughput by enabling concurrent interleaving across ranks, which means faster access to frequently requested lookup tables and more responsive multi-threaded workloads. With a 1.8V operating voltage and conservative CAS 5 latency at 667 MHz, it balances energy-efficient thermals with deterministic cycle times, keeping rack-density server cooling predictable and your mission-critical operations resilient around the clock.

Endurance & Reliability

Based on the specifications (FB-DIMM, ECC, 240-pin, DDR2-667), this is unequivocally a Server Memory Module. Capacity planning must respect the limitations of its Fully Buffered DDR2 architecture while maximizing stability for legacy enterprise workloads.

General Virtualization
For a general virtualization host, populate memory channels symmetrically to leverage the FB-DIMM’s four-channel architecture. Using eight of these 4GB modules (32GB total) provides a balanced capacity for hosting multiple lightweight, legacy virtual machines without oversubscribing memory bandwidth. Avoid mixing capacities per branch to maintain the Advanced Memory Buffer (AMB)'s timing integrity.

In-Memory Database
An in-memory database demands maximum capacity and strict error correction, making the ECC feature critical. Deploy a configuration of at least sixteen identical modules (64GB) to hold significant datasets like a Redis or Memcached instance fully in RAM. This uniform, high-density setup minimizes memory-side latency and prevents the catastrophic data corruption that non-ECC memory risks under heavy write loads.

High-Performance Computing (HPC)
HPC memory sizing should prioritize sustained throughput over sheer capacity to feed data to compute nodes without stalling. Install a full set of eight matched M395T5160QZ4-CE68 modules (32GB) across the four channels to ensure quad-channel interleaving, maximizing the 667MHz bandwidth. Given the age of DDR2, securing spares is vital; plan capacity while reserving 1–2 modules on a certified hardware compatibility list for immediate failure replacement to maintain cluster uptime.

Verified Compatibility

Strictly tested server memory. Compatible with Dell PowerEdge 2950, HP ProLiant DL380 G5, IBM System x3650.

FAQ