General

Engineer's Note

This DDR4-2666 Registered ECC RDIMM is a server-class memory module purpose-built for enterprise platforms handling virtualization, in-memory databases, and data-integrity-critical workloads. Its single-rank x4 organization minimizes electrical loading to preserve signal integrity at high densities, while the registered buffer and full ECC safeguard against single-bit errors for uncompromising uptime and data accuracy.

Technical Specs & Insights

1. Registered signal buffering re-drives command and address buses, maintaining signal integrity across densely populated server boards for unwavering high-availability operation.
2. ECC protection automatically corrects single-bit errors in real time, eliminating silent data corruption during critical financial transactions and long-running analytics jobs.
3. 2666MHz operating speed provides a peak transfer rate of 21.3 GB/s per channel, accelerating throughput for memory-intensive virtualization and in-memory database workloads.
4. 1.2V low-power design curbs overall rack energy expenditure and thermal output, helping hyperscale data centers keep cooling costs under control around the clock.
5. Single Rank x4 organization minimizes electrical loading on the memory controller, allowing fully populated channels to sustain stable performance in large-footprint virtual machine deployments.

Why These Specs Matter

The Samsung M393A2K40CB2-CTD7Q is a server-grade DDR4-2666 Registered DIMM, purpose-built for mission-critical enterprise workloads where data integrity and uncompromising uptime are non-negotiable. Its ECC technology continually detects and corrects single-bit memory errors, which is vital in virtualized clusters—imagine a hypervisor hosting dozens of VMs on a single node; an undetected bit-flip in one tenant’s memory space could cascade into silent data corruption or an entire ESXi host crash. The Registered signal buffer stabilizes high-density configurations by reducing electrical load on the memory controller, letting you populate all channels with 16GB or larger modules without sacrificing signal quality. This directly supports memory-hungry in-memory databases like SAP HANA or Redis, where a single rank x4 organization balances bandwidth and latency to sustain millions of transactions per second. Combined with a 1.2V operating voltage that curbs power draw across a rack full of servers, this module ensures that every terabyte of RAM in your data center works as reliably at 3 AM as it does during peak business hours.

Endurance & Reliability

General Virtualization
Equip each CPU socket with one 16 GB DDR4-2666 RDIMM per memory channel—typically 6 or 8 modules—giving 96 GB or 128 GB per node. This balanced population ensures maximum memory throughput for dozens of VMs and stable ECC protection.

In-Memory Database
For large working sets, fill all DIMM slots using 16 GB RDIMMs; a dual-socket platform with 24 slots provides 384 GB of addressable memory. Keep one DIMM per channel (1DPC) to retain the full 2666 MHz speed and the low CL19 latency essential for in-memory caches like Redis or SAP HANA. Scale horizontally when capacity demand grows instead of mixing different DIMM densities.

High-Performance Computing (HPC)
Install one 16 GB RDIMM in every memory channel to maximize bandwidth—typically 12 or 16 modules across two CPUs for 192 GB or 256 GB total. The single-rank x4 design operates at 1DPC at the rated 2666 MT/s, delivering tight latency for parallel simulation and modeling codes. Use identical modules to prevent timing variance under heavy floating-point loads.

Verified Compatibility

Server memory rigorously tested and verified compatible with Dell PowerEdge R760, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650, and more.

FAQ