General

Engineer's Note

This PC2-4200R module is a DDR2-533 Registered DIMM with ECC, purpose-built for legacy server platforms where data integrity under sustained loads is critical. Its registered signal architecture and ECC engine make it well-suited for memory-intensive virtualization or small-scale database applications, while single-rank organization at CL4 helps maintain stable command timing in older multi-slot server boards.

Technical Specs & Insights

1. ECC protection silently corrects single-bit memory errors in real time, preserving data integrity for financial transactions and database queries that cannot tolerate silent corruption.
2. Registered signaling buffers the command and address lines, enabling stable population of multiple DIMMs per channel and maintaining reliable operation under heavy memory workloads.
3. The 1.8V operating voltage adheres to the JEDEC standard for DDR2, ensuring consistent power delivery and thermal behavior critical for rack-dense server environments.
4. A capacity of one gigabyte suits dedicated lightweight appliance roles, such as DNS caching or firewall services, where predictability and low resource overhead are prioritized over raw density.
5. PC2-4200 bandwidth delivers steady throughput for sequential data access patterns, supporting stable performance in file serving and basic web hosting scenarios without introducing bottlenecks.

Why These Specs Matter

As a DDR2-533 Registered ECC DIMM operating at 1.8V with a single-rank layout, the PC2-4200R is purpose-built for server environments where reliability defines uptime. In a virtualized cluster, the registered buffer decouples the memory bus from the DRAM chips, allowing you to fill all DIMM slots without signal degradation — this keeps hypervisors stable when dozens of guest VMs compete for resources. ECC protection is then the silent guardian: it corrects single-bit errors on the fly, preventing silent data corruption in memory-resident databases like Redis or in-memory analytics platforms where even one flipped bit can skew financial aggregates. The single-rank design lowers electrical capacitance, which improves signal margin and reduces heat in fully loaded racks, prolonging hardware life. Meanwhile, CL4 latency delivers consistent, low-latency responses for time-sensitive database queries during peak workloads. For your data center, this memory module means fewer unexpected reboots, trusted data integrity, and predictable performance that safeguards your business-critical applications.

Endurance & Reliability

General Virtualization
This is registered DDR2-533 ECC memory, designed for legacy server platforms. For general virtualization on older hypervisors, populate all memory channels symmetrically to maximize available RAM. Since these 1 GB modules are low density, plan for 16–32 modules to reach 16–32 GB, which is the bare minimum for running multiple lightweight virtual machines.

In-Memory Database
In-memory databases demand both capacity and data integrity, making ECC mandatory. However, 1 GB DIMMs severely limit total capacity; you would need an impractical number of modules to hold even modest datasets. If you must use this hardware, install the maximum supported configuration—often 64–128 GB across many slots—and ensure all modules are identical single-rank DIMMs to avoid loading issues on the registered buffer.

High-Performance Computing (HPC)
HPC workloads rely on memory bandwidth and error resilience, both served by registered ECC RAM. With PC2-4200, the 533 MHz speed and CL4 latency are bottlenecks, but filling all memory banks to achieve interleaving will recover some performance. Plan for a fully populated, balanced configuration across all memory risers or boards to sustain throughput in parallel computation tasks.

Verified Compatibility

Rigorously tested server memory, compatible with Dell PowerEdge 1950, HP ProLiant DL380 G5, and IBM System x3650.

FAQ