General

Engineer's Note

This 128GB DDR4-2400 RDIMM, engineered with ECC and an octal-rank x4 organization, is expressly built for memory-intensive server platforms running virtualization or in-memory databases, where its Registered buffer maintains signal stability across high-density configurations. The CL17 latency provides responsive data access while the ECC error correction safeguards critical data integrity, ideal for enterprise workloads that cannot tolerate downtime.

Technical Specs & Insights

1. The 128GB capacity enables each RDIMM to host extensive in-memory databases or high-count virtual machines, directly boosting consolidation ratios per server node.
2. ECC error correction continuously detects and fixes single-bit flips, ensuring data integrity for financial transactions and long-running analytics workloads.
3. Registered signal type buffers command and address lines, keeping electrical loading stable when all memory channels are fully populated in large-scale server deployments.
4. Octal Rank x4 organization packs extreme density on a single stick, preserving free DIMM slots for future scaling while sustaining heavy multi-tenant throughput.
5. PC4-19200 bandwidth delivers consistent 19.2 GB/s per module, preventing memory bottlenecks for virtualization hosts handling simultaneous live migrations and storage I/O.

Why These Specs Matter

In the data center, the M386AAK40B40-CUC 128GB DDR4-2400 RDIMM is engineered to eliminate the risks and performance bottlenecks that keep IT architects awake at night. Its ECC protection acts as a relentless safeguard against single-bit errors caused by cosmic radiation or electrical noise; in a dense virtualization cluster where a single corrupted bit can crash a host running dozens of VMs, this integrity means uncompromised multi-tenant uptime. The registered interface stabilizes command and address signals, enabling fully populated memory channels without signal degradation — critical when you need 1.5 TB of RAM for SAP HANA in-memory workloads. The module’s octal-rank x4 organization maximizes bank-level parallelism, delivering the sustained bandwidth that real-time analytics and high-frequency trading demand. And with 128 GB on a single stick, you minimize the number of DIMM slots required to reach capacity, leaving room to scale as datasets grow. For virtualized environments and memory-intensive databases, this RDIMM becomes a genuine competitive edge.

Endurance & Reliability

General Virtualization
For dense virtualization hosts, this 128GB Registered ECC DDR4-2400 module allows you to maximize memory capacity per channel with fewer DIMM slots. Populate at least one DIMM per memory channel to sustain bandwidth, and aim for balanced configurations across all CPU memory controllers to avoid NUMA penalties. With its octal-rank x4 organization, expect a slight latency trade-off, but the sheer capacity per socket easily supports dozens of VMs.

In-Memory Database
In-memory databases demand both capacity and data integrity, making ECC RDIMMs mandatory. Deploy these 128GB modules in a fully populated configuration to reach terabyte-scale memory pools while keeping clock speeds stable at 2400 MT/s. Even with CL17 latency, the massive capacity reduces the need for cluster sprawl, and the registered buffer maintains signal integrity under heavy, sustained loads.

High-Performance Computing
HPC workloads often prize bandwidth over latency, so install one of these 128GB DIMMs per channel across all available channels to saturate the memory bus. The octal-rank x4 design delivers strong bandwidth but adds latency—mitigate this by tuning your rank interleaving settings in the BIOS. For memory-capacity-bound simulations, the 128GB density per stick lets you scale problem sizes without resorting to slower off-node storage.

Verified Compatibility

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

FAQ