General

Engineer's Note

This is a server-class DDR4-3200 Registered DIMM with ECC, ideally suited for enterprise virtualization, in-memory databases, and data-critical workloads where data integrity and uptime are paramount. Its octal-rank x4 configuration delivers immense 256 GB capacity per module while the registered signal type buffers the command/address bus, stabilizing multi-DIMM channels in dense 2P/4P server platforms.

Technical Specs & Insights

1. The enormous per-module capacity enables extreme memory density in a single server node, allowing massive virtualization consolidation without the performance penalties of socket interleaving.
2. High data rate feeds each CPU core with bandwidth to match multi-core throughput, slashing latency for in-memory databases and large-scale analytics under constant query loads.
3. End-to-end error correction delivers silent data corruption protection, ensuring uncompromised data integrity for financial ledgers and life-critical enterprise processing.
4. Registered buffering stabilizes command and address signals across fully loaded memory channels, preserving reliable performance when all DIMM slots are populated in scale-up platforms.
5. Octal-rank x4 organization multiplies bank-level parallelism, sustaining high throughput even as simultaneous VMs compete for memory, making it ideal for overcommitted virtualized environments.

Why These Specs Matter

The M393ABG40M52-CAE is a 256GB DDR4-3200 Registered ECC memory module built for enterprise servers, and its architecture directly addresses the critical pain points of data center operations. In a dense virtualization cluster running dozens of VMs on a single host, the 256GB capacity combined with Registered signal buffering ensures reliable communication across massive memory banks. This means you can confidently scale VM density without worrying about signal degradation or system instability that plagues unbuffered memory under heavy load. The integrated ECC engine actively corrects single-bit errors in real time, an essential safeguard when even one flipped bit in a financial database or hypervisor memory space could corrupt transactions or silently crash workloads. Meanwhile, the Octal Rank x4 organization maximizes interleaving, dramatically boosting bandwidth for in-memory databases like SAP HANA or Redis. When your analytics queries scan terabytes of hot data, this design reduces memory latency and prevents bottlenecks, delivering the consistent sub-millisecond response times your applications demand. Deployed in an in-memory database server, this module translates directly to faster decision-making and uncompromised data integrity around the clock.

Endurance & Reliability

General Virtualization

For dense virtualization hosts running multiple VMs, deploy a balanced population of these 256GB RDIMMs across all memory channels. A dual-socket server with 16 DIMM slots per CPU (one DIMM per channel) can reach 4TB total, comfortably supporting over 200 typical VMs while leaving headroom for memory overcommit. Avoid mixing different ranks or capacities to maintain uniform latency and simplify NUMA-aware tuning.

In-Memory Database

In-memory databases like SAP HANA or Redis demand low latency and absolute stability. Populate all memory channels identically with one 256GB module per channel to maximize bandwidth, and enable mirroring or sparing if the platform supports it to guard against uncorrectable errors. With 22.22ns CAS latency and octal-rank x4 organization, these RDIMMs deliver the combination of huge capacity and reliable ECC needed to hold terabytes of hot data entirely in DRAM.

High-Performance Computing

For HPC workloads that prize bandwidth over sheer capacity, install one DIMM per channel across all available slots to sustain peak 3200MT/s throughput. In memory-bandwidth-bound simulations (CFD, weather modeling), a full population of these octal-rank RDIMMs can provide over 200 GB/s per socket, feeding the CPU with enough data to keep all cores saturated. Use identical modules in every channel to avoid clock downgrades and ensure predictable runtimes across cluster nodes.

Verified Compatibility

This server memory has been rigorously tested and is compatible with Dell R760, HPE DL380 Gen11, Lenovo SR650 V3.

FAQ