General

Engineer's Note

This 16GB DDR3-1866 RDIMM is engineered for legacy server platforms optimized for memory-intensive workloads such as virtualization and in-memory databases. Its dual-rank x4 configuration maximizes bank-level parallelism while the registered ECC architecture and tight CL13 latency guarantee exceptional signal integrity and end-to-end data protection under sustained heavy loads.

Technical Specs & Insights

1. Generous per-module capacity allows dense server configurations to host more virtual machines and larger memory-resident datasets, directly boosting consolidation ratios.
2. High clock speed delivers superior data throughput, accelerating transactional databases and real-time analytics under demanding enterprise workloads.
3. ECC protection automatically corrects single-bit memory errors, safeguarding financial records and critical uptime against silent data corruption.
4. Registered clock driver enables massive memory scalability with enhanced signal integrity, essential for populating all DIMM slots in high-availability servers.
5. Dual-rank x4 organization interleaves memory accesses across ranks, maximizing channel utilization and sustaining throughput during heavy multi-core processing.

Why These Specs Matter

The Samsung M393B2G70QH0-CMAQ8 is a 16GB DDR3-1866 registered ECC memory module purpose‑built for server environments where downtime is not an option. Its Error Correcting Code actively identifies and repairs single‑bit memory errors the moment they occur. In a multi‑tenant virtualization cluster, a silent bit flip in a hypervisor can cascade into corrupted guest states and unplanned failovers; ECC transforms that risk into a self‑correcting event that keeps your SLAs intact.

The registered buffer chip on this RDIMM stabilizes command and address signals, allowing a server to support far more DIMMs per channel than unregistered alternatives. This directly enables the 256 GB, 512 GB, or larger memory footprints demanded by in‑memory databases like SAP HANA or Redis clusters, where the entire working set must reside in RAM for sub‑millisecond latency. Combined with a dual‑rank x4 organization at 1866 MHz and CL13, the module exploits rank interleaving to overlap consecutive accesses, squeezing out higher sustained bandwidth. Under heavy OLAP query loads, this means faster table scans and more predictable data throughput. Every one of these characteristics translates into a server that runs cooler, scales further, and protects transactional data relentlessly.

Endurance & Reliability

This 16 GB DDR3-1866 RDIMM (M393B2G70QH0) is a registered ECC module built for dual-socket servers. Capacity planning requires balancing channel population, rank loading, and workload-specific demands.

General Virtualization
Populate one DIMM per channel to achieve 128 GB on an 8-channel platform, providing sufficient headroom for moderate VM density without memory overcommit. For larger consolidation, install two DIMMs per channel to reach 256 GB, accepting the minor frequency drop that occurs under 2DPC operation on DDR3; always use identical batches to preserve ECC and sparing reliability.

In-Memory Database
Maximize capacity by filling every available slot—a 24-slot system reaches 384 GB using these dual-rank modules. Capacity takes priority over peak frequency, as fitting the entire dataset in memory avoids disk I/O; the ECC protection guards transactional integrity without compromising responsiveness.

High-Performance Computing
Install exactly one DIMM per channel to sustain full 1866 MT/s bandwidth, delivering 128 GB of low-latency memory across eight channels. The dual-rank x4 organization feeds each channel efficiently while avoiding inter-rank contention that would penalize MPI or simulation codes. Reserve 2DPC configurations only when per-node memory limits force a trade-off between capacity and speed.

Verified Compatibility

Rigorously tested server memory, compatible with Dell PowerEdge R720, HP ProLiant DL380p Gen8, Lenovo System x3650 M4.

FAQ