General

Engineer's Note

With its Registered ECC design and quad-rank x4 organization, this 64GB DDR4-2133 RDIMM delivers robust data integrity and high-density memory capacity ideal for virtualization and in-memory database workloads. The CL15 latency at 1.2V provides stable, energy-efficient operation, ensuring reliable performance under heavy multi-threaded server loads.

Technical Specs & Insights

1. 64GB capacity per module dramatically increases memory density in rack servers, allowing a single node to host far more virtual machines without expanding hardware footprint.
2. ECC actively corrects single-bit data errors in real time, protecting financial transactions or database queries from silent corruption during continuous operation.
3. Registered buffering redrives address and command signals, preserving signal integrity when every DIMM slot is populated for maximum capacity deployments.
4. Quad Rank x4 organization interleaves multiple DRAM banks to keep server memory channels saturated, cutting latency variability under heavy analytics workloads.
5. DDR4-2133 delivers consistent baseline throughput with minimal power draw, ideal for energy-conscious data centers running web services that demand steady response rates.

Why These Specs Matter

The M393A8G40D40-CPB is a server-grade DDR4 Registered ECC DIMM, purpose-built for data centers where unscheduled downtime is simply not an option. Its ECC technology delivers what matters most: data integrity. In large-scale virtualization clusters, a silent bit-flip caused by background radiation can corrupt a hypervisor’s memory space, crashing dozens of virtual machines. ECC actively detects and corrects these errors in real time, keeping your multi-tenant environment stable and your SLAs intact. Equally critical is the registered signal buffer, which isolates the memory controller from the electrical load of 64 GB packed into a single module. For an in-memory database like SAP HANA or Redis, this means you can populate four or even eight DIMM slots per host without sacrificing signal quality or risking boot failures, achieving terabytes of reliable, low-latency storage. The quad-rank x4 organization further elevates throughput by enabling deeper interleaving, so when an analytics engine scans massive datasets, parallel access across ranks saturates memory bandwidth more efficiently. Backed by EU RoHS and FCC compliance, every one of those 288 pins builds the foundation for predictable performance in mission-critical deployments where capacity, correctness, and continuous operation define your competitive edge.

Endurance & Reliability

This 64GB DDR4-2133 registered ECC RDIMM is purpose-built for servers. Use these capacity planning guidelines based on your workload:

General Virtualization
Install at least one DIMM per memory channel to balance capacity and bandwidth. For a dual-socket server, 256 GB (4×64 GB) supports many VMs; expand to 512 GB to eliminate memory overcommit risk. Always populate channels with identical modules for uniform latency.

In-Memory Database
Populate all memory channels completely with 64 GB RDIMMs, aiming for 512 GB to 1 TB per node. The registered ECC design protects data integrity, while quad-rank x4 organization maximizes capacity per channel. Avoid uneven population as it cuts throughput for large in-memory queries.

High-Performance Computing (HPC)
Fill every channel symmetrically to exploit memory interleaving; for example, 12 DIMMs across two sockets ensure peak aggregate bandwidth. Since quad-rank DIMMs at 2133 MT/s may drop in speed if channels are fully loaded, verify platform capabilities. A balanced 384 GB (6×64 GB) per socket suits capacity-intensive simulations.

Verified Compatibility

Rigorously tested for seamless compatibility with Dell PowerEdge R750, R650, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650.

FAQ