General

Engineer's Note

This DDR-400 registered ECC RDIMM is engineered for legacy server platforms requiring absolute data integrity, making it well-suited for memory-resident databases and small-scale virtualization workloads on aging but mission-critical systems. The module’s dual-rank x4 organization and CAS latency of 3 ensure stable, low-latency operation, while its registered signal buffering enhances signal integrity in fully populated server boards.

Technical Specs & Insights

1. ECC support detects and corrects single-bit memory errors, preventing silent data corruption in critical server workloads such as transactional databases or virtualization hosts.
2. Registered signal buffering stabilizes electrical loads across multiple DIMMs, enabling dependable scalability for memory-hungry enterprise applications that demand non-stop uptime.
3. Dual Rank x4 organization uses interleaved access to maximize channel utilization, maintaining consistent throughput for numerous virtual machines under heavy consolidation.
4. 2 GB capacity supplies a dependable foundation for legacy server roles like DNS or lightweight web services, keeping essential daemons responsive without invoking swap degradation.
5. DDR-400 speed provides a steady 3.2 GB/s bandwidth ceiling, ensuring legacy server processors are fed with enough data to handle concurrent user requests without stalling.

Why These Specs Matter

The MT36VDDF25672Y-40BF3 is an RDIMM engineered for server platforms where uptime and data integrity are not negotiable. Its ECC technology actively detects and corrects single-bit memory errors, a silent threat that can corrupt financial transactions or crash a virtualized host overnight. Combined with a registered buffer, this module decouples the electrical load from the memory controller, letting you populate all DIMM slots in a 2U rack server without signal degradation — a direct enabler for dense virtualization clusters running dozens of VMs per node. The dual-rank x4 organization then elevates in-memory database performance by interleaving accesses across internal banks, effectively pipelining read requests so that applications like Redis or SAP HANA experience lower queuing latency even under heavy concurrency. At a CAS latency of 3 cycles and 400 MHz, each transaction is processed with deterministic speed, making the module a foundation for workload-consolidation environments where every microsecond of delay translates into lost revenue. This is not just compliant memory; it is risk mitigation built into your infrastructure.

Endurance & Reliability

General Virtualization
For server platforms utilizing this 2GB DDR-400 RDIMM, populate all available memory banks evenly to maximize interleaving and total capacity within the platform’s limits. A typical virtualization host running multiple light VMs can begin with four or six identical modules (8–12GB) to balance memory overhead and cost, ensuring each memory channel is loaded symmetrically for stable throughput. Leverage the ECC and registered signaling to safeguard multi-tenant environments against single-bit errors under sustained uptime.

In-Memory Database
Capacity is constrained by the 2GB module size, so deploy the maximum number of modules the server board supports—often 8 ranks across four channels—to build the largest possible reliable pool. ECC and registered architecture are critical here, preventing silent data corruption in caching and real-time analytics sets that must reside entirely in RAM. Avoid mixing different rank counts or CAS latencies, as consistency directly impacts transactional latency and checkpoint performance.

HPC (High-Performance Computing)
Bandwidth-sensitive HPC workloads benefit from a balanced, multi-channel configuration using identical Dual Rank x4 modules to enable memory interleaving. Install a fully populated set of these RDIMMs (e.g., 8 x 2GB across two or four channels) to sustain parallel floating-point or modeling tasks, where ECC corrects cosmic-ray-induced faults without halting compute jobs. Though the DDR-400 frequency is modest, the registered buffer maintains signal integrity in dense node configurations, ensuring deterministic runtimes across cluster nodes.

Verified Compatibility

Rigorously tested server memory; compatible with Dell PowerEdge 2850, HP ProLiant DL380 G4, IBM xSeries 346.

FAQ