General

Engineer's Note

This Samsung 2GB DDR3-1333 Unbuffered ECC UDIMM (M391B5773DH0-CH9) is an entry-level server and workstation memory module that leverages single-rank x8 organization and CL9 latency for low-latency operation. Its 1.5V ECC and unbuffered signal architecture deliver critical data integrity and signal stability, making it ideally suited for small business servers, NAS systems, and professional content-creation workstations where error-free uptime is essential.

Technical Specs & Insights

1. ECC single-bit error correction safeguards data integrity, preventing silent corruption during financial transactions or database hosting in always-on server environments.
2. Unbuffered UDIMM design eliminates register delay, delivering the low command latency needed for responsive dedicated hosting appliances and entry-level virtualization.
3. Single Rank x8 configuration presents a lighter electrical load to the memory controller, improving signal stability and broad compatibility across single-socket server boards.
4. 1333MHz bandwidth paired with CL9 timings provides a steady 10.6 GB/s throughput, keeping legacy enterprise workloads performant without requiring costly platform retrofits.
5. Two-gigabyte module capacity keeps the memory footprint minimal for lightweight virtualized microservices, helping operators reduce power draw and scale cost-efficiently.

Why These Specs Matter

Based on the parameters—especially the combination of ECC error correction and the 240-pin UDIMM form factor—the M391B5773DH0-CH9 is a server-grade DDR3 memory module purpose-built for single-socket workstations and entry-level servers where data integrity and cost-efficiency must coexist. Its four defining characteristics translate directly into real-world operational reliability.

The integrated ECC protection continuously detects and corrects single-bit memory errors right in the silicon. For a virtualization cluster hosting multiple guest operating systems on one physical node, this means a background cosmic-ray-induced bit flip will silently corrupt a virtual disk or crash an entire tenant workload on non-ECC desktop RAM, but here it is caught and corrected before it becomes a data corruption ticket—your virtual machines stay up and your SLAs remain intact. The Unbuffered architecture (UDIMM), combined with a tight CL9 latency, keeps the electrical path direct between the CPU memory controller and the DRAM chips. In an in-memory database like Redis or Memcached serving thousands of queries per second, UDIMM eliminates the extra clock cycle overhead that registered modules introduce, shaving nanoseconds off every transaction while still guarding your cache sets with ECC. The 1.5V DDR3 standard and Single Rank x8 organization ensure broad compatibility with popular microserver platforms and manageable thermal output inside dense 1U chassis. For a ZFS-based NAS or a lightly loaded domain controller handling authentication and file services, this 2GB module provides the exact, economical capacity needed without wasting power on over-provisioned ranks. This memory turns a budget-conscious server build into a dependable platform where corrected errors never become emergency pages and where consistent low-latency access keeps line-of-business services snappy under real user loads.

Endurance & Reliability

This is a server-grade ECC Unbuffered UDIMM (DDR3‑1333, 2GB). Its single‑rank x8 design with unbuffered ECC targets entry‑level servers and workstations that mandate data integrity but use standard DIMM slots.

General Virtualization
For a light hypervisor such as ESXi or Proxmox hosting a handful of VMs, populate all available slots with identical modules. A common 12‑DIMM board yields 24GB, giving enough overhead for 4–6 basic guests. Stick to matched pairs per channel to retain dual‑channel bandwidth and keep unbuffered latency low for interactive services.

In‑Memory Database
When supplying a dedicated Redis or Memcached node, install the maximum supported DIMMs—12×2GB for 24GB of ECC‑protected cache. Full slot population delivers the highest aggregate capacity from these low‑density modules, while identical single‑rank DIMMs prevent rank‑mixing penalties that can disturb predictable microsecond response.

High‑Performance Computing
In a small compute cluster built on older Xeon E3 or Opteron platforms, equip each node with a full complement of modules (24GB) for uniform per‑node memory. ECC guards against silent bit‑flips during long parallel runs. Populate all channels symmetrically to balance bandwidth and enable seamless interleaving, which benefits repeatedly accessed working sets common in HPC workloads.

Verified Compatibility

Validated for servers: rigorously tested ECC UDIMM, compatible with Dell PowerEdge R210 II, R310, T110 II, HP ProLiant ML110 G7.

FAQ