General

Engineer's Note

Designed for demanding server environments, this 128GB DDR4-2400 Registered ECC RDIMM features an octal-rank x4 configuration to maximize memory density per channel while maintaining signal integrity. Its ECC and registered architecture make it ideal for virtualization clusters and in-memory databases where data accuracy and system uptime are critical.

Technical Specs & Insights

1. 128GB capacity per module drastically increases memory density per server slot, empowering dense virtualization clusters and large in-memory databases without sacrificing rack space.
2. ECC protection automatically detects and corrects single-bit memory errors, preserving data integrity for mission-critical enterprise applications and preventing costly unplanned downtime.
3. The registered signal type buffers command and address lines, ensuring clean signal integrity when all memory channels are populated, which is essential for stable operation in multi-socket server platforms.
4. Octal Rank x4 organization packs eight ranks of x4 DRAM devices, boosting bank-level parallelism and delivering consistent bandwidth for heavily concurrent analytical and transactional workloads.
5. DDR4 technology with native 1.2V operation reduces overall power draw and thermal output across the data center, directly contributing to lower energy costs and higher rack-level reliability.

Why These Specs Matter

In virtualized data centers and in-memory database servers, the Samsung M386AAK40B40-CUC5Q 128GB DDR4-2400 RDIMM delivers four critical attributes that directly prevent downtime and performance bottlenecks. ECC error correction stops single-bit soft errors from corrupting hypervisor state or silent data in a Redis instance—without it, a cosmic-ray-induced flip could crash dozens of VMs or invalidate financial transactions. Registered buffering enables you to populate 24 DIMM slots at full speed, giving your virtualization cluster 3TB of reliable RAM per host without signal integrity issues. The 128GB high-density module means you achieve that capacity with fewer DIMMs, cutting power and cooling costs while preserving upgrade headroom. Finally, the octal-rank x4 organization dramatically multiplies bank groups, allowing the memory controller to overlap read/write commands. For real-time analytics, this sustains higher bandwidth under random access, slashing latency by up to 20%. Every VM migration, every database commit, stays consistent and fast.

Endurance & Reliability

General Virtualization
For dense virtualization hosts, deploy one 128GB RDIMM per memory channel to achieve balanced capacity and bandwidth. In a dual-socket server with eight channels per CPU, 16 modules deliver 2TB, comfortably supporting hundreds of VMs. If total capacity demands exceed this, populate a second module per channel but monitor for potential speed reduction to 2133MT/s.

In-Memory Database
Maximize socket memory by fully loading all DIMM slots with these 128GB sticks. A 24-slot dual-socket server yields 3TB, enabling large in-memory datasets for real-time analytics. ECC and registered buffering guarantee the data integrity and stability essential for transactional databases. Pair with persistent memory mirrors if uptime is critical.

High-Performance Computing
To sustain peak floating-point throughput, install one 128GB RDIMM per channel across all available memory channels. For a dual-socket cluster node with 12 channels, this provides 1.5TB of high-bandwidth capacity, ideal for simulation and modeling. The octal-rank x4 organization ensures low latency under heavy simultaneous access, while the 2400MT/s speed maintains feed to multicore processors.

Verified Compatibility

Rigorously tested, compatible with Dell PowerEdge R740, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650, and more.

FAQ