General

Engineer's Note

This RDIMM with ECC and registered signal type is engineered for server platforms handling virtualization, in-memory databases, and mission-critical workloads where data integrity is non-negotiable. Its single-rank x8 configuration and CL19 latency ensure stable, efficient signaling on dense 288-pin memory channels, while registered logic reduces electrical load for superior reliability in multi-DIMM configurations.

Technical Specs & Insights

1. ECC protection corrects single-bit errors in real time, crucial for preventing silent data corruption during transaction processing and long-running analytics.
2. Registered buffering strengthens signal integrity across densely populated channels, giving data centers the freedom to scale memory capacity without compromising stability.
3. The elevated clock rate accelerates virtual machine memory paging, keeping latency-sensitive applications responsive even under peak consolidation.
4. Ultra-low voltage operation cuts overall server power draw, which directly reduces cooling costs and supports higher rack densities in colocation environments.
5. Single Rank x8 architecture presents a lighter electrical load, enabling consistent high-speed access and better memory channel balance for containerized microservices.

Why These Specs Matter

The Samsung M393A1K43BB1-CTD7Y is an 8GB DDR4-2666 Registered DIMM purpose-built for server environments, and four of its architectural characteristics directly address the critical pain points of enterprise IT. First, the Error Correcting Code (ECC) capability automatically detects and corrects single-bit memory errors, which is non-negotiable for in-memory databases like SAP HANA or Redis where silent data corruption could cascade into financial discrepancies or cache poisoning. Second, the Registered signal type buffers command and address lines, enabling a virtualization cluster to populate all 24 DIMM slots per host without signal degradation—this stabilizes dense multi-tenant operations that would otherwise suffer boot failures and random VM crashes from electrical loading. Third, the 2666MHz speed and single-rank x8 organization strike an optimal balance between bandwidth and access latency, allowing a multi-node vSAN or Nutanix cluster to sustain high throughput during live migrations and real-time analytics without straining the memory controller. Fourth, the 1.2V low-voltage design reduces thermal output in fully loaded 1U rack servers, lowering fan power draw and extending component lifespan in environments where every watt counts toward TCO. For a hypervisor host or a database appliance, this module does not simply store data—it actively preserves uptime and transactional consistency under punishing 24/7 loads.

Endurance & Reliability

Server Memory Capacity Planning Guide

The module identified is an 8GB DDR4-2666 ECC Registered RDIMM (1.2V, CL19, single rank x8). RDIMMs with error correction are purpose‑built for server‑class stability, making this a reliable building block for enterprise workloads. Planning must balance total capacity against the channel and rank architecture of the target platform.

General Virtualization
For moderate VM density (e.g., 20–40 light instances), populate at least four modules per socket to enable quad‑channel memory interleaving while reaching 32GB total. This provides ample headroom for hypervisor overhead and avoids memory ballooning. Scale to six or eight identical 8GB RDIMMs for higher consolidation ratios without sacrificing registered DIMM signal integrity.

In‑Memory Database
In‑memory databases such as Redis or SAP HANA demand both capacity and latency control. Install six or eight modules to reach 48–64GB—enough for substantial datasets—and deliberately populate one DIMM per channel to maintain single‑rank access, minimizing load and improving CL19 timing margins. Avoid mixing densities; uniform 8GB RDIMMs deliver predictable low‑latency profiles.

High‑Performance Computing
HPC applications benefit from maximum memory bandwidth. Fill all available channels with identical 8GB RDIMMs, typically eight per dual‑socket node for 64GB, to exploit full channel parallelism. Single‑rank x8 configurations keep bus loading light, sustaining DDR4‑2666 speeds under sustained floating‑point or simulation loads where every cycle counts.

Verified Compatibility

Validated server memory. Compatible with Dell PowerEdge R740, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650, and more.

FAQ