General

Engineer's Note

Designed as a 2GB DDR3-1333 Registered ECC module, this DIMM is purpose-built for entry-level server platforms where data integrity and system stability are critical for light virtualization and small-scale memory caching. Its dual-rank x8 configuration and CL9 latency deliver balanced load distribution and reliable signal integrity, ensuring consistent performance in 24/7 operating environments.

Technical Specs & Insights

1. Registered signal type buffers command and address lines, stabilizing signal integrity across densely populated server boards to maintain uptime in multi-DIMM configurations.
2. ECC error correction detects and corrects single-bit memory faults, protecting transactional databases and in-memory caches from silent data corruption around the clock.
3. Dual Rank x8 organization interleaves memory accesses across two internal ranks, boosting effective bandwidth for consistent hypervisor responsiveness under mixed workload virtualization.
4. 1333MHz clock speed delivers a balanced stream of throughput per channel, sustaining steady application performance in cost-optimized legacy server deployments.
5. CL9 column access latency provides predictable read response timing, reducing memory wait states in latency-sensitive financial or monitoring services without sacrificing reliability.

Why These Specs Matter

As a DDR3-1333 Registered ECC DIMM with dual rank x8 and CL9 latency, the MT18JSF25672PDY-1G4 answers the toughest demands of data-center servers. In a VMware or Hyper-V virtualization cluster, a single uncorrected memory error can corrupt multiple guest VMs, causing unplanned downtime and data inconsistency. This module’s ECC corrects these faults on the fly, turning silent bit-flips into non-events. The registered clock buffer maintains signal integrity across all 240 pins when populating all DIMM slots—essential for hosts running dozens of VMs. Its dual rank x8 design uses rank interleaving to pipeline read/write operations, boosting throughput for concurrent virtual machines. For in-memory databases like Redis caching live user sessions or financial ledgers, the CL9 latency reduces query response times, and ECC guarantees no calculus error corrupts cached values. The 1333MHz frequency balances energy consumption and performance for 24/7 operation.

Endurance & Reliability

Capacity Planning Guide for DDR3-1333 ECC RDIMM (2GB Module)

This memory type is a registered ECC DDR3 module, designed for servers and workstations requiring data integrity and multi-DIMM scalability. The following recommendations address common server workloads using these 2GB modules.

General Virtualization
Virtual hosts rely on balanced memory per core. For moderate consolidation, install six to eight modules per CPU socket (12–16GB total) to support 10–15 light VMs. Use triple-channel configurations where possible, populating identical DIMMs across all blue memory slots to maximize throughput.

In-Memory Database
Low latency and error correction are critical. Deploy a symmetric dual-processor setup with at least 12 DIMMs total (24GB) to hold key datasets in cache. Populate all channels equally with one DIMM per channel to maintain full memory bandwidth. Scale by adding matched quad-ranked kits only if the memory controller supports mixed ranking.

High-Performance Computing
HPC nodes demand maximum bandwidth per core. Fill all three channels per processor with identical 2GB DIMMs (six modules per CPU, 12GB total) for balanced access. Avoid leaving channels empty; unbalanced configurations cause bandwidth starvation in memory-bound scientific simulations. For dense clusters, this cost-effective population suits compute-heavy, capacity-light tasks.

*Note: These modules are not suitable for desktop or laptop systems due to registered ECC signaling.*

Verified Compatibility

Rigorously tested server RDIMM; compatible with Dell PowerEdge R710, HP ProLiant DL380 G7, Lenovo ThinkServer RD630.

FAQ