General

Engineer's Note

This Samsung M393B1K70DH0-CMA is an 8GB DDR3-1866 Registered ECC memory module (RDIMM) optimized for legacy server platforms where data integrity under continuous operation is critical. Its dual-rank x4 organization and CL13 latency provide a balanced combination of bank-level parallelism and access speed, making it well-suited for virtualization hosts and modest in-memory database workloads that demand reliable registered signaling and single-bit error correction.

Technical Specs & Insights

1. ECC error correction detects and corrects single-bit memory faults on the fly, preserving data integrity for financial ledgers and virtualized databases where even silent corruption is unacceptable.
2. The registered signal type buffers command and address lines, sharply reducing electrical load on the memory controller so the server can maintain rock-solid stability with fully populated channels.
3. Dual Rank x4 interleaving keeps memory pipelines saturated, sustaining predictable low-latency throughput when dozens of virtual machines contend for shared resources under consolidation.
4. An 1866 MT/s transfer rate lifts peak bandwidth for each channel, cutting through in-memory analytics workloads and speeding up response times on heavily hit database cache tiers.
5. The 8GB capacity per DIMM strikes a pragmatic density sweet spot for scale-out nodes and edge servers, where stacking multiple reliable modules matters more than chasing maximal per-slot capacity.

Why These Specs Matter

Designed explicitly for enterprise servers, the Samsung M393B1K70DH0-CMA RDIMM directly addresses the stability and uptime challenges faced in data centers. Its registered architecture buffers command and address signals, enabling a single memory channel to support multiple high-density modules without the electrical load degrading signal integrity. For a virtualization cluster hosting dozens of VMs, this means you can populate all 24 slots on a dual-socket board and the platform stays rock-solid under sustained workloads, eliminating the memory-related crashes that would cascade into massive service disruption.

The integrated ECC is your frontline defense against bit-flip errors induced by ambient radiation or aging silicon. In an in-memory database like Redis or SAP HANA, a single undetected bit corruption can silently poison a financial transaction record or a customer profile, leading to irreversible business consequences. ECC detects and corrects single-bit errors automatically, preserving data fidelity without performance penalty. Further, the dual-rank x4 organization and 1866MHz frequency deliver the low-latency, high-bandwidth concurrency essential for heavy analytics; dual rank interleaves internal banks so that while one rank is refreshing, the other can still serve read requests, effectively squeezing more throughput out of each clock cycle and keeping your virtualized workloads responsive under peak query loads.

Endurance & Reliability

This is a server-class DDR3 Registered ECC DIMM. Capacity planning must leverage its 8 GB density, ECC protection, and 1866 MT/s speed for reliable, balanced performance. Below are targeted recommendations for typical server workloads.

General Virtualization
For hosting multiple VMs, balance memory bandwidth and capacity. Populate all memory channels symmetrically—typically one or two 8 GB RDIMMs per channel across both sockets—to enable full interleaving and 128 GB to 256 GB total. Using two DIMMs per channel (2DPC) still delivers solid throughput and adequate density for mid-size consolidation, but be aware that DDR3-1866 may step down to 1600 MT/s at 2DPC depending on the platform.

In-Memory Database
Maximise total capacity even if speed reduces slightly. Fill every available DIMM slot (e.g., 24 slots in a dual-socket server) with 8 GB RDIMMs to reach up to 192 GB. The large working set stays fully resident, avoiding disk I/O penalties. Registered ECC ensures data integrity for mission-critical in-memory stores and large cache clusters.

High Performance Computing
Prioritise raw memory bandwidth and latency. Install one 8 GB RDIMM per channel (1DPC configuration) to sustain the full 1866 MT/s frequency and clean signal timing. For an eight-channel dual-socket node, that yields 64 GB of fast memory—ideal for MPI workloads and tightly coupled simulations where bandwidth per core matters more than total capacity.

Verified Compatibility

Rigorously tested server RDIMM, compatible with Dell PowerEdge R720/R620, HP ProLiant DL380p Gen8, and Lenovo ThinkServer RD630.

FAQ