General

Engineer's Note

Based on the FB-DIMM form factor, ECC support, and fully buffered signal type, this DDR2-667 module is unequivocally server memory. It is best suited for legacy enterprise servers and high-availability platforms running memory-intensive workloads like virtualization or in-memory databases, where its ECC error correction and the fully buffered architecture’s point-to-point serial interface ensure data integrity and signal stability under heavy multi-rank configurations.

Technical Specs & Insights

1. ECC protection corrects single-bit memory errors on the fly, safeguarding transactional data integrity for mission-critical server workloads.
2. Fully Buffered architecture extends the maximum number of modules per channel, enabling larger memory footprints without compromising signal integrity in dense data centers.
3. Dual Rank x8 organization interleaves access across multiple internal banks, maximizing available bandwidth and keeping virtualized environments responsive under heavy load.
4. The 667 MHz clock rate delivers consistent PC2-5300 throughput, ensuring stable operation for aging enterprise platforms that demand worry-free uptime.
5. CAS latency of five cycles optimizes command-to-data turnaround, reducing memory access delays in latency-sensitive financial or database applications.

Why These Specs Matter

Designed for the relentless demands of enterprise servers, the M395T2953CZ4-CE6 FB-DIMM integrates four defining characteristics that directly translate into mission-critical reliability and performance where it matters most. Its ECC engine means single-bit memory errors, which naturally occur due to cosmic radiation and become statistically inevitable across large server farms, are detected and transparently corrected before they corrupt transactional databases or in-memory analytics; in a virtualized cluster hosting dozens of VMs, that is the difference between zero-touch uptime and silent data corruption cascading through your guests. The Fully Buffered architecture serializes communications via an Advanced Memory Buffer, preserving signal integrity across numerous modules—crucial when scaling to the high capacities that dense consolidation workloads demand—and eliminating the electrical loading headaches of traditional registered DIMMs. Deploying the module’s Dual Rank x8 organization enables rank interleaving, allowing your memory controller to concurrently activate one rank while precharging another, which dramatically reduces access latency in random-read scenarios like an in-memory database querying millions of keys. And with carefully binned DDR2-667 timings at CL5, the M395T2953CZ4-CE6 strikes a deliberate balance between bandwidth and latency, ensuring that your SAP HANA or Redis instances sustain predictable response times during peak OLTP bursts without sacrificing the throughput required for massive parallelization.

Endurance & Reliability

General Virtualization
For a DDR2-era server platform, capacity per module is limited to 1 GB. In a general virtualization host, maximize the number of identical FB-DIMMs—typically eight or sixteen modules—to reach 8–16 GB total, which allows a modest number of light VMs. Always populate in matched sets across memory channels to maintain balanced interleaving and avoid performance penalties.

In-Memory Database
An in-memory database demands the largest possible footprint and low latency, but the 1 GB FB-DIMM cap constrains single-server instances. Install the maximum supported modules—often 16 or 32 sticks—to achieve 16–32 GB, and configure sparingly large pages. Given the age of DDR2, consider clustering multiple nodes instead of relying on a single host for substantial in-memory workloads.

High-Performance Computing
HPC workloads on a DDR2 platform require sustained bandwidth, which means populating all memory channels fully with identical dual-rank DIMMs. A typical dual-socket server should be equipped with 16 modules (8 per CPU) to achieve 16 GB and peak interleaved bandwidth. ECC and fully buffered architecture add reliability and signal integrity, but the 667 MHz speed remains the hard performance ceiling.

Verified Compatibility

Strictly tested, compatible with servers like Dell PowerEdge 2950, HP ProLiant DL380 G5, IBM x3650.

FAQ