General

Engineer's Note

The M393T6553CZ3-CCC is a DDR2-400 Registered ECC server memory module whose registered signal type and ECC error correction ensure ironclad data integrity and stability for legacy virtualization or in-memory database platforms. Its single-rank x8 configuration combined with a low CL3 latency optimizes bus efficiency and access speeds, making it a reliable choice for mission-critical 240-pin server workloads where uptime is paramount.

Technical Specs & Insights

1. ECC error detection and correction eliminate single-bit memory errors, preserving data integrity for financial transactions and mission-critical database workloads without downtime.
2. Registered buffering of address and command signals stabilizes signal integrity across high-capacity memory channels, allowing dense multi-DIMM configurations essential for large-scale virtualization hosts.
3. Single Rank x8 organization reduces electrical loading on the memory bus, improving signal reliability and enabling seamless population across all server DIMM slots at full speed.
4. DDR2 technology delivers proven deterministic latency behavior, ensuring predictable performance for legacy industrial control systems and long-lifecycle enterprise platforms.
5. CL3 column access latency contributes to minimal initial access delay, accelerating random data retrieval in caching and indexing services where every nanosecond counts.

Why These Specs Matter

Designed specifically for server environments, the M393T6553CZ3-CCC is a DDR2-400 Registered ECC DIMM that addresses the most critical demands of enterprise computing. Its four defining characteristics become indispensable when you examine real-world data-center workloads. First, ECC technology actively detects and corrects single-bit memory errors, a necessity in scenarios like in-memory databases or financial transaction logs where a silent bit-flip can corrupt records or lead to miscalculations. Second, the registered signal type buffers command and address lines, which stabilizes the electrical load on the memory controller; this is essential when populating multiple DIMMs per channel in a virtualization cluster, ensuring that dozens of virtual machines run reliably without memory-related crashes. Third, the single-rank x8 organization delivers consistent access latency and broad compatibility with older server chipsets, helping database query caches maintain predictable response times under sustained pressure. Finally, the 1.8V operating voltage, lower than many legacy memory types, contributes to reduced thermal output in high-density rack systems, lowering cooling costs over a fleet of machines. For any IT team maintaining legacy but mission-critical infrastructure, this module’s combination of integrity, stability, and efficiency directly translates into minimized downtime and protected data.

Endurance & Reliability

General Virtualization

For legacy DDR2-400 registered memory, capacity per module is only 512 MB. In a hypervisor-based virtualized environment, memory is the primary bottleneck. You must populate all available DIMM slots to maximize total RAM; a dual-socket server with 8 slots per channel can barely reach 8–16 GB. Consolidate lightweight Linux VMs only and avoid memory overcommit to prevent ballooning and swapping on this slow 400 MHz bus.

In-Memory Database

In-memory databases demand large, low-latency memory pools, making this module unsuitable for all but the smallest test datasets. The 512 MB capacity and DDR2-400 bandwidth severely restrict working set size. A fully populated server might provide 16 GB, which is only viable for a tiny Redis or Memcached instance. Strongly consider retiring this hardware and replacing it with DDR4 or DDR5 platforms for any production in-memory workload.

High Performance Computing

HPC clusters require high memory bandwidth and capacity per node. The DDR2-400 registered RDIMM delivers only 3.2 GB/s peak bandwidth per channel, and the 512 MB capacity forces extreme parallel decomposition. This module may serve in a legacy cluster for educational batch jobs or lightweight MPI exercises. If you must reuse it, configure the largest possible node count to aggregate memory across many systems, treating each node as a thin compute unit.

Verified Compatibility

Validated server memory, rigorously tested for compatibility with Dell PowerEdge 2950, HP ProLiant DL380 G5, IBM System x3650, and similar platforms.

FAQ