General

Engineer's Note

This is a server-class DDR3 Very Low Profile (VLP) Registered DIMM with ECC, specifically engineered for dense virtualization and memory-intensive database workloads in 1U/2U rack servers where z-height is constrained. Its Dual Rank x4 organization combined with a low CL7 latency delivers balanced signal integrity and robust error correction, ensuring data integrity under sustained, heavy memory access.

Technical Specs & Insights

1. ECC error correction proactively detects and fixes single-bit memory faults, preserving data integrity for mission-critical enterprise workloads where even transient corruption is unacceptable.
2. Registered signal buffering enables stable operation across fully populated memory channels, allowing server platforms to scale to higher capacities without compromising command-address reliability.
3. Dual Rank x4 organization interleaves internal banks to sustain high channel utilization, directly supporting smooth virtual machine responsiveness under heavy consolidation.
4. The Very Low Profile RDIMM form factor shortens the module height, improving front-to-back airflow in dense 1U/2U rack servers to keep thermal conditions within safe 24/7 operating limits.
5. A 1066 MHz clock rate provides an 8.5 GB/s bandwidth ceiling that aligns perfectly with legacy enterprise servers, prioritizing deterministic latency and uptime over raw speed.

Why These Specs Matter

The M392B1K70BM1-CF8 is a server-grade DDR3 VLP RDIMM, and its four defining characteristics directly address the most unforgiving challenges of enterprise data centers. The ECC engine systematically corrects single-bit memory errors before they cascade into silent data corruption, which is simply non-negotiable when a virtualization cluster manages dozens of tenant workloads on a single node—one flipped bit in a hypervisor page table can collapse an entire revenue-generating service. The registered interface buffers command and address signals, decoupling the memory controller from the electrical load of all installed DIMMs. This allows a 2U database server to fully populate its channels with high-density modules while maintaining crisp signal integrity, ensuring an in-memory analytics platform never drops a long-running query due to instability at scale. The dual-rank x4 organization interleaves internal banks so that while one rank is refreshing or discharging, the other can still accept read bursts, effectively hiding precharge latency and sustaining steady bandwidth under heavy random access. For a Redis or SAP HANA instance that serves tens of thousands of small transactions per second, that bank-level parallelism translates directly to higher throughput and lower tail latency. Finally, the very low profile form factor unlocks critical thermal headroom in densely packed blade enclosures and microservers where every millimeter of clearance lets cool air reach downstream processors, preventing thermal throttling during sustained memory-intensive operations. This memory module does not just meet a specification—it eliminates compliance and thermal risk in deployments where uptime and predictability are the real currency.

Endurance & Reliability

Memory Type Identification:
The module M392B1K70BM1-CF8 is an 8GB DDR3-1066 VLP RDIMM with ECC and registered signaling, clearly designed for server platforms. Its ECC and registered features ensure data integrity and signal stability in multi-slot configurations, making it suitable for enterprise environments.

General Virtualization
For general virtualization, memory density and reliability are key. Populate at least six identical 8GB RDIMMs across three channels per CPU (e.g., 48GB total for a single socket) to balance capacity and interleaving. This supports a moderate number of virtual machines while maintaining consistent performance and ECC protection.

In-Memory Database
In-memory databases demand maximum capacity and low latency within a single server. Fill all available DIMM slots with these 8GB modules, typically reaching 128GB or more on dual-socket systems, to keep entire datasets in RAM. Leverage the registered design to maintain signal integrity even at full population, reducing response times for real-time analytics.

High-Performance Computing (HPC)
HPC workloads benefit from high memory bandwidth and large per-node capacity. Deploy modules in a balanced configuration—six or eight identical DIMMs per socket—to utilize all memory channels effectively. This setup enables efficient parallel processing of large scientific models, while ECC safeguards long-running computations against memory errors.

Verified Compatibility

Rigorously tested, compatible with servers like Dell PowerEdge R710, HP ProLiant DL380 G7, IBM System x3650 M3.

FAQ