General

Engineer's Note

The M393B5173QH0-CMA is a server-grade DDR3-1866 Registered DIMM with ECC, purpose-built for virtualization platforms, in-memory databases, and mission-critical workloads where data integrity is non-negotiable. Its registered signal topology stabilizes high-capacity memory configurations by reducing electrical load on the memory controller, while the single-rank x8 organization and CL13 latency deliver consistent, low-latency access ideal for dense, multi-DIMM server deployments.

Technical Specs & Insights

1. RDIMM architecture provides signal buffering, enabling large memory populations essential for heavy server workloads without compromising signal integrity.
2. ECC protection automatically corrects single-bit errors, safeguarding data integrity in mission-critical enterprise environments where uptime is paramount.
3. Registered signal lines reduce electrical loading on the memory bus, allowing servers to scale up to maximum capacity configurations reliably.
4. High-speed data rate delivers substantial memory bandwidth, accelerating database queries and virtual machine responsiveness under concurrent loads.
5. Modest density makes this module ideal for lightweight virtualization hosts, dedicated caching tiers, or micro-service deployments where power and cost efficiency take priority.

Why These Specs Matter

In mission‑critical server environments like virtualized clusters and in‑memory databases, the M393B5173QH0‑CMA RDIMM transforms key technologies into tangible uptime and performance. Its ECC engine continuously corrects single‑bit errors—an indispensable defense against cosmic‑ray‑induced bit flips that silently corrupt financial transactions or database indexes. With Registered logic, the module buffers command and address signals, allowing a hypervisor host to populate all channels with dozens of DIMMs without signal degradation; that translates directly into hosting more VMs per node and running larger Redis or Memcached footprints with deterministic latency. The 1866‑MHz clock rate, coupled with CL13 latency, feeds data‑hungry CPUs a steady 14.9 GB/s bandwidth, accelerating analytic queries and live migration operations. And because it’s built as a single‑rank x8 module, it places lighter electrical load on the memory controller, enabling dual‑socket systems to sustain high bus speeds even when fully loaded—eliminating the speed‑downgrade surprises that disrupt virtual machine responsiveness. For IT managers, this means fewer silent corruptions, denser consolidation, and predictable performance under the constant pressure of always‑on services.

Endurance & Reliability

General Virtualization
For general virtualization hosts, populate all memory channels symmetrically to maximize bandwidth and ensure consistent VM performance. Deploy these 4GB RDIMMs in sets of six or eight per CPU, aiming for total capacities of 96GB to 256GB depending on VM density, while leaving room for future scaling.

In-Memory Database
In-memory databases demand the lowest latency and highest capacity, so completely fill every DIMM slot with these modules and configure identical ranks across channels. Given the 4GB capacity per stick, target at least 384GB on a dual-socket system—using 24+ modules—to hold large datasets entirely in RAM and avoid storage I/O bottlenecks.

High-Performance Computing (HPC)
HPC workloads benefit from balanced memory bandwidth, so install an equal number of DIMMs per CPU socket and use the fastest supported speed (DDR3-1866) with all channels populated. While 4GB modules yield moderate node capacities (64–128GB), prioritize populating one or two DIMMs per channel to maintain high clock rates and avoid rank-induced speed reductions during parallel simulations.

Verified Compatibility

Rigorously tested for server use; compatible with Dell PowerEdge R720, HPE DL380p Gen8, and Lenovo System x3650 M4.

FAQ