General

Engineer's Note

This DDR-400 Registered ECC module is strictly engineered for legacy server platforms, where its dual-rank x4 organization improves memory bank interleaving and sustained throughput under concurrent access. It best serves virtualization hosts or lightweight in-memory databases that depend on ECC error correction and registered signal buffering to ensure long-term data integrity and system stability.

Technical Specs & Insights

1. Single-bit error correction and multi-bit detection prevent silent data corruption, securing financial transactions and database queries in always-on server environments.
2. The registered buffer isolates the DRAM loads from the memory controller, enabling stable population of all DIMM slots in multi-socket servers for maximum scalability.
3. Dual-rank interleaving with x4 organization maximizes command bus efficiency, raising sustained throughput for virtualized workloads running concurrent tenant applications.
4. A 3.2 GB/s peak transfer rate keeps latency-sensitive legacy workloads responsive, which is critical for industrial control and legacy telecom systems that demand deterministic timing.
5. CAS 3 latency reduces the wait cycles for the first word of data, accelerating small-block access patterns typical of database index lookups and memory-resident caching engines.

Why These Specs Matter

The Micron MT36VDDF25672Y-40BD2 is a legacy DDR Registered DIMM purpose-built for server environments where relentless uptime and data integrity define operational success. Its ECC engine actively detects and corrects single-bit errors, shielding a virtualization cluster from silent memory corruption that could silently destabilize multiple guest machines or corrupt file system metadata. The registered signal buffering becomes indispensable when populating all available slots with these 2 GB modules, as it stabilizes command and address lines so your rack server can scale memory capacity without sacrificing electrical integrity under heavy, mixed-workload consolidation. The dual-rank x4 organization further enables rank interleaving, delivering higher effective bandwidth that lets an in-memory database like Redis breeze through concurrent read requests, reducing transaction tail latency during peak loads. Paired with a 400 MHz clock and a tight CAS latency of 3 cycles, this module furnishes predictably low access times, keeping hypervisor scheduling responsive and transactional queries snappy. Deploying this memory protects your legacy infrastructure with the reliability, scalability, and deterministic performance that enterprise applications cannot compromise.

Endurance & Reliability

This DDR-400 ECC Registered RDIMM (2GB) is a server-class module. Capacity planning must work around the low per-DIMM density while exploiting the registered design’s ability to populate all slots.

General Virtualization
For a host running 8–12 light VMs, assign 2–4GB per VM. Populate every available slot (e.g., 8 sticks for 16GB) with these 2GB RDIMMs; registered ECC ensures stability under consolidation. Keep a small swap volume on fast storage to handle occasional memory overcommit.

In-Memory Database
Maximise error-free capacity by filling all DIMM slots—up to 32GB with 16 modules. The registered ECC protects in-memory stores like Redis from corruption. Because 2GB sticks limit single-node capacity, plan a sharded, multi-node architecture for datasets exceeding 16–32GB.

HPC
Memory bandwidth is critical for parallel codes. Install modules in identical pairs across all memory channels to enable interleaving, and populate every slot to maximise aggregate throughput. The registered architecture permits a full complement of 8 or 16 sticks, delivering a balanced 16–32GB per node with ECC reliability, which suits throughput-bound MPI workloads.

Verified Compatibility

Rigorously tested server memory, compatible with Dell PowerEdge 2850, HP ProLiant DL360 G4, IBM xSeries 346, and similar systems.

FAQ