General

Engineer's Note

This 64GB DDR4-2133 Registered ECC RDIMM (quad-rank x4) is a server-class memory module engineered for enterprise platforms that demand maximum capacity and data integrity, making it ideal for virtualization hosts, in-memory databases, and dense multi-socket systems. Its registered signal architecture stabilizes high-capacity configurations, while full ECC and the quad-rank organization ensure reliable operation and maintain consistent performance under heavy, sustained workloads.

Technical Specs & Insights

1. A dense 64GB per module maximizes memory footprint in limited DIMM slots, enabling higher virtual machine density without sacrificing performance.
2. Hardware-level error correction safeguards transactional data integrity, essential for financial databases and mission-critical enterprise workloads.
3. Registered signal buffering stabilizes command and address lines, allowing fully populated server boards to operate reliably under maximum load.
4. Quad Rank x4 organization interleaves multiple internal banks, boosting effective memory bandwidth for parallel analytics and large in-memory caches.
5. DDR4-2133 provides a balanced 17 GB/s per channel throughput, ensuring consistent low-latency access for latency-sensitive enterprise applications.

Why These Specs Matter

This Samsung M386A8K40BMB-CPB4Q is a 64GB DDR4-2133 registered DIMM engineered for the server environment, and its four defining characteristics translate directly into business continuity and performance. The ECC technology corrects single-bit memory errors before they can corrupt transactional data or cause silent data corruption in an in-memory database like SAP HANA—an absolute requirement where a flipped bit could mean a financial discrepancy or a crashed instance. The registered signal buffer stabilizes the command and address buses, which allows a single server to support quad-rank, 64GB modules across all 24 slots without signal degradation; in a dense virtualization cluster running dozens of VMs, this means you can confidently scale to 1.5TB per host without random reboots. The quad-rank x4 organization maximizes capacity per channel while interleaving accesses to deliver sustained bandwidth under heavy load. Finally, operating at a low 1.2V, this module helps keep the thermal and power footprint in check across a fully populated rack, reducing cooling costs in a 24/7 data center. Together, these features make it a cornerstone for memory-centric workloads where uptime and data fidelity are non-negotiable.

Endurance & Reliability

General Virtualization
For a typical virtualization host, deploy at least two M386A8K40BMB-CPB4Q modules per server to enable dual-channel operation and provide 128GB of baseline capacity. This configuration comfortably supports 20–30 moderate virtual machines, balancing density and cost. Populate identical modules in pairs to maintain balanced memory access and avoid performance penalties from mismatched ranks.

In-Memory Database
Maximize capacity by installing eight modules for 512GB total, leveraging the RDIMM’s registered ECC to safeguard in-memory datasets. The quad-rank x4 organization delivers strong chip-level parallelism, which benefits large working sets in databases like SAP HANA or Redis. Distribute modules evenly across all memory channels to sustain high throughput under demanding transactional loads.

High-Performance Computing
Use a fully populated configuration—eight or more modules per dual-socket node—to reach terabyte-scale memory, critical for simulations and large-scale modeling. The 2133MHz speed with CL15 latency offers a stable foundation, though pairing with higher-frequency parts in the same channel causes downclocking to the lowest common speed. Validate QPI/UPI bandwidth and populate equivalent ranks per channel for optimal numerical computation throughput.

Verified Compatibility

Rigorously tested, compatible with Dell PowerEdge R760, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650.

FAQ