General

Engineer's Note

The M393B2G70DB0-CMAQ2 is a server-grade DDR3-1866 registered ECC RDIMM, purpose-built for virtualization, in-memory databases, and latency-sensitive enterprise workloads where data integrity is non-negotiable. Its dual-rank x4 organization combined with registered signaling and CL13 latency delivers robust signal stability and efficient interleaving, ensuring reliable 1.5V operation and single-symbol error correction in high-density memory deployments.

Technical Specs & Insights

1. ECC memory detects and corrects single-bit errors in real time, preserving data integrity for financial transactions and database queries where even a silent corruption is unacceptable.
2. Registered signal buffering stabilizes command and address signals across fully loaded server boards, enabling seamless scaling to 24 DIMMs per node without compromising reliability.
3. Dual Rank x4 organization delivers sustained bandwidth under mixed workloads, ensuring predictable VM response times when hosting dozens of virtual desktops on a single host.
4. CL13 low latency accelerates in-memory caching operations, reducing the CPU stall cycles that directly impact user-facing application performance in high-frequency trading platforms.
5. 16GB capacity per module strikes an optimal density sweet spot for mid-range virtualization clusters, maximizing memory channels without forcing costly overprovisioning of unused capacity.

Why These Specs Matter

The Samsung M393B2G70DB0-CMAQ2 is a 16GB DDR3 Registered ECC DIMM built for server environments, where four characteristics become critical. ECC continuously corrects single-bit errors—in a cluster hosting tens of VMs, this stops silent corruption from escalating into crashes and downtime. The registered clock driver preserves signal quality with fully loaded channels, enabling you to scale to the large capacities needed for dense consolidation or to fit entire in-memory databases like Redis without instability. The dual-rank x4 organization uses rank interleaving to mask precharge delays and boost sustained bandwidth, accelerating database queries and analytics workloads. With an 1866MHz clock and CL13 latency, the module keeps transactional and caching systems responsive. These features deliver hardened data integrity, higher VM density, and low latency—directly improving service uptime and reducing TCO.

Endurance & Reliability

General Virtualization
With 16GB RDIMMs running at 1866MHz, a balanced virtualization host benefits from six to eight identical modules per CPU to populate all memory channels, delivering 96–128GB total capacity. This configuration avoids performance penalties from unbalanced DIMM population while leaving room for moderate VM density. Stick to matched kits and verify the server’s population order to maintain Rank Interleaving and maximize throughput for mixed workloads.

In-Memory Database
In-memory databases demand low latency and high reliability, making ECC Registered DIMMs essential. A two-socket server fully loaded with 16GB dual-rank x4 modules—typically 24 DIMMs for 384GB—provides a solid foundation for datasets that must reside entirely in RAM. Prioritize filling all channels with identical, single-vendor modules to guarantee stable 1866MT/s signaling and reduce the risk of silent data corruption under continuous heavy read/write stress.

High-Performance Computing (HPC)
HPC clusters thrive on bandwidth, so install eight or sixteen DIMMs per node to achieve maximum memory bandwidth through full channel population. The CL13 latency and 1866MHz speed offer a deterministic response suitable for tightly coupled MPI workloads. While 16GB per DIMM balances cost and density, plan capacity so that working sets never spill to swap, as disk I/O stalls can cripple scaling efficiency across hundreds of nodes.

Verified Compatibility

This server memory has passed rigorous testing; compatible with Dell PowerEdge R720, HP DL380p Gen8, Lenovo RD630, Cisco C220 M3.

FAQ