General

Engineer's Note

Designed for enterprise servers and data-critical workloads, this 256GB DDR4-2933 Registered ECC module ensures uncompromising data integrity in virtualization clusters and in-memory databases. Its octal-rank x4 configuration delivers maximum capacity density per channel, while 1.2V operation and CL21 latency optimize power efficiency and stability under sustained heavy load.

Technical Specs & Insights

1. High-density module capacity enables dense server virtualization, allowing more virtual machines per node without memory bottlenecks and optimizing data center footprint.
2. ECC protection instantly corrects single-bit errors, preserving data integrity for mission-critical workloads such as financial transactions and databases.
3. Registered buffering stabilizes signal distribution across high-capacity configurations, ensuring reliable uptime in fully populated server platforms.
4. Octal Rank x4 architecture maximizes per-channel memory depth while keeping channels saturated, essential for large-scale in-memory analytics and AI inference.
5. Elevated clock speed accelerates data throughput, reducing latency in real-time caching and rapid query processing under heavy concurrent access.

Why These Specs Matter

The Samsung M393ABG40M5B-CYFCQ is a server-grade DDR4 RDIMM purpose-built for enterprise workloads where stability and scalability are non-negotiable. Its massive 256GB capacity directly addresses the pain of memory saturation in dense virtualization clusters. When you consolidate hundreds of VMs per host, every gigabyte counts—this module lets you pack more tenants onto fewer servers, reducing licensing and hardware costs. The ECC technology protects against silent data corruption, a critical safeguard for in-memory databases like SAP HANA or Redis, where a single bit flip could crash transactions or corrupt analytics. Registered signal buffering ensures clean data paths even when all 24 DIMM slots are populated, maintaining rock-solid uptime under heavy load. Furthermore, the Octal Rank x4 architecture leverages rank interleaving to deliver higher sustained bandwidth, preventing bottlenecks when dozens of VMs compete for memory access simultaneously. With a low 1.2V operating voltage, it also helps trim power bills in data centers.

Endurance & Reliability

General Virtualization
For dense VM hosting, a single 256GB RDIMM per socket offers exceptional density. Deploy one DIMM per channel (1DPC) initially to maximize memory bandwidth while leaving slots free for future scaling. This configuration easily supports over 100 moderate VMs on a dual‑socket server.

In-Memory Database
Latency‑sensitive workloads like Redis or SAP HANA benefit from the 256GB module’s Octal Rank x4 organization, which interleaves requests for lower effective latency. Pair two identical modules in a 2‑DIMM‑per‑channel (2DPC) setup to reach 512GB per CPU, ideal for large in‑memory datasets, though expect a slight speed drop to 2666 MT/s due to rank loading.

High‑Performance Computing
For HPC clusters, balance capacity and bandwidth. Use a single 256GB RDIMM per memory channel (1DPC) to sustain the full 2933 MT/s speed and minimize jitter during tightly‑coupled MPI jobs. This yields 2TB per 8‑channel processor, enabling large simulations while keeping latencies predictable under heavy floating‑point loads.

Verified Compatibility

Rigorously tested server memory for Dell PowerEdge R740, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650 V2.

FAQ