General

Engineer's Note

Designed for enterprise servers, this 64GB DDR4-2133 registered ECC module with quad-rank x4 organization ensures robust data integrity and signal stability for memory-intensive workloads such as virtualization and in-memory databases. Its low 1.2V voltage and CL15 latency optimize power efficiency and responsiveness in multi-DIMM platforms where high capacity and reliability are critical.

Technical Specs & Insights

1. High-density module doubles the memory footprint per slot, enabling denser virtualization and larger in-memory databases without scaling out servers.
2. ECC protection proactively detects and corrects single-bit errors, preserving data integrity for mission-critical workloads where uptime is non-negotiable.
3. Registered signal architecture buffers command and address lines, stabilizing multi-DIMM configurations and enabling maximum server memory scalability without compromising signal integrity.
4. Quad Rank x4 organization maximizes capacity per DIMM, allowing heavy consolidation of virtual machines while maintaining balanced memory access across banks.
5. Low-voltage operation significantly cuts power draw per module, reducing energy costs and thermal output in densely-packed server racks.

Why These Specs Matter

The Samsung M393A8K40B21-CRB00 is a 64GB DDR4-2133 Registered DIMM engineered for enterprise servers, where every architectural decision directly impacts business continuity. In virtualized clusters, its ECC correction is indispensable: a single undetected bit flip in a hypervisor can silently corrupt multiple guest operating systems, yet this module actively corrects those errors, safeguarding always-on stability across your entire VM fleet. The registered buffer then stabilizes signal loads when all 24 DIMM slots are populated, allowing you to confidently scale to terabytes of RAM per host and pack more virtual machines onto each physical node without electrical instability. For in-memory databases like SAP HANA, the quad-rank x4 design becomes a strategic advantage. By stacking four ranks of high-density x4 DRAM on a single module, it maximizes socket capacity so you can load multi-terabyte datasets entirely into memory with fewer DIMMs, accelerating real-time analytics and transaction throughput. Finally, the 1.2V operating voltage dramatically reduces power draw across thousands of modules in a hyperscale data center, cutting cooling costs and enabling denser, greener infrastructure. These four characteristics—active error correction, registered signal buffering, quad-rank density, and low-voltage efficiency—translate directly to higher uptime, greater workload consolidation, and a measurably lower total cost of ownership in virtualized and data-intensive environments.

Endurance & Reliability

Capacity Planning Guide for Server DDR4 RDIMM (64GB, 2133MHz, ECC Registered, Quad Rank x4)

This module’s ECC, registered, and quad-rank design is purpose-built for server platforms, delivering high reliability and the support for large memory populations required in data center workloads. Below are configuration recommendations for three common server scenarios.

General Virtualization
Virtualization thrives on balanced memory capacity and CPU cores. Deploy six or eight of these 64GB RDIMMs per dual-socket host to reach 384–512 GB, comfortably hosting 30–50 medium-sized VMs. Distribute modules evenly across all memory channels to maximize bandwidth, and leave at least two DIMM slots free to accommodate future growth without a full node refresh.

In-Memory Database
Low-latency database engines such as Redis or SAP HANA demand maximum RAM and data integrity. Populate all channels of a multi-socket server with these 64GB sticks, targeting 1–2 TB per node to hold entire datasets in memory. Prioritize symmetric channel population and identical part numbers to avoid speed penalties, and leverage ECC to guard against silent data corruption under heavy write loads.

High-Performance Computing
HPC clusters benefit from massive memory bandwidth and per-socket capacity. Fill every DIMM slot across both sockets—24 modules in a typical 2U 12-channel server—to achieve 1.5 TB total. While the 2133MHz speed is modest, the high rank count improves interleaving; paired with tuned BIOS settings for memory access, this setup sustains large-scale simulations and computational fluid dynamics jobs with minimal swapping.

Verified Compatibility

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

FAQ