General

Engineer's Note

This 64GB DDR4-2666 Registered ECC RDIMM is engineered for enterprise server platforms handling virtualization, in-memory databases, and other data-integrity-critical workloads. The Quad Rank x4 organization combined with registered signal buffering and ECC delivers exceptional reliability and consistent performance under heavily loaded memory channels, while the CL19 latency ensures stable, predictable access times.

Technical Specs & Insights

1. High-density module design maximizes memory footprint per server, enabling significantly larger virtual machine deployments and expanding in-memory database capacity without adding extra nodes.
2. ECC protection silently corrects single-bit errors in real time, preserving data integrity essential for financial transactions, scientific computing, and prolonged mission-critical uptime.
3. Registered buffering stabilizes signal integrity when fully populating memory channels, allowing enterprises to scale total RAM capacity seamlessly across demanding consolidation workloads.
4. Quad Rank organization multiplies internal bank concurrency, keeping memory channels deeply saturated and sustaining high throughput under heavy virtualization mixes.
5. Low-voltage operation curbs power draw across dense rack deployments, directly lowering cooling overhead and improving overall data center energy efficiency.

Why These Specs Matter

Designed for data centers, the 64GB DDR4-2666 Registered ECC DIMM (M386A8K40CM2-CTD6Q) offers four crucial capabilities for demanding workloads. Its 64GB density minimizes slot usage in virtualized hosts running dozens of VMs, preserving expansion room. ECC error correction guards against silent data corruption—a single flipped bit in a hypervisor or database log could crash the entire system; ECC detects and corrects it instantly. The registered buffer ensures clean signal transmission even with all channels fully populated, critical for scaling beyond 1TB RAM. Moreover, the quad-rank x4 configuration employs rank interleaving to raise bandwidth and reduce latency, directly accelerating in-memory databases such as Redis and SAP HANA. Query response times shrink because the controller pipelines operations across ranks. This module empowers your virtualized clusters and memory-intensive applications to run with unwavering reliability and speed.

Endurance & Reliability

General Virtualization
This 64GB RDIMM is ideal for dense virtualization hosts running multiple VMs. On a dual-socket server, install at least four identical modules to populate one DIMM per channel, balancing capacity and memory bandwidth. For typical mixed workloads, aim for 256–512GB total using eight to sixteen of these modules, leaving room for future scaling.

In-Memory Database
Low-latency ECC protection makes this module well-suited for in-memory databases like Redis or SAP HANA. Deploy in a fully balanced configuration—one DIMM per channel across all memory channels—to maximize throughput and avoid bottlenecks. For large datasets, completely fill all available DIMM slots with these 64GB quad-rank DIMMs, prioritizing capacity over slightly reduced speed when running at 2666MT/s.

High-Performance Computing
Registered ECC memory ensures data integrity during long-running HPC simulations. Use a symmetrical population, placing equal DIMMs in each memory channel to sustain high memory bandwidth per core. For memory-bandwidth-bound applications, start with one DIMM per channel; if the workload demands more capacity, scale to two DIMMs per channel while accepting the slight drop to a lower speed grade.

Verified Compatibility

Compatibility verified: rigorously tested with Dell PowerEdge R740/R760, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650, and Supermicro servers.

FAQ