General

Engineer's Note

This is a legacy DDR3 server memory module (RDIMM) with ECC and registered signal types, ideally suited for older virtualization hosts, memory-resident databases, or compute clusters where data integrity and stability are critical. The dual-rank x4 configuration combined with its low 1.35V operating voltage delivers a balance of high-capacity throughput and reduced power consumption per DIMM, while registered buffering ensures signal robustness in fully populated 24/7 server environments.

Technical Specs & Insights

1. ECC memory detects and corrects single-bit errors in real time, safeguarding transactional databases and financial computations from silent data corruption in always-on server environments.
2. Registered signal buffering stabilizes command and address lines, enabling scalable memory populations across numerous DIMM slots for dense virtualization clusters without signal degradation.
3. Dual Rank x4 organization interleaves multiple banks of DRAM pages, sustaining high throughput under concurrent query loads that typify multi-tenant SaaS backends.
4. 1333MHz clock speed delivers up to 10.6 GB/s of bandwidth per channel, ensuring smooth data flow for in-memory caching engines and real-time analytics workloads.
5. 1.35V low-voltage operation reduces overall rack-level power draw and thermal output, lowering cooling costs in hyperscale data centers while maintaining base-clock reliability.

Why These Specs Matter

This Samsung module (M393B1K70DH0-YH9Q8) is an 8GB DDR3 RDIMM purpose-built for servers, and its four defining characteristics directly tackle the most painful realities of data center operations. Its ECC error correction is non-negotiable for data integrity: in an in-memory database like SAP HANA or a financial trade journal, a single cosmic-ray bit flip can silently corrupt a transaction. ECC detects and corrects these errors in real time, preventing costly data poison and maintaining the trustworthiness of your critical workloads without restarting services.

The registered signal buffer is what allows dense virtualization clusters to scale reliably. When a hypervisor is running 40 virtual machines on a dual-socket host, unbuffered DIMMs would suffer signal degradation and impose a limit of two or three modules per channel. This RDIMM buffers the command and address lines, enabling you to fully populate all 24 slots with 192GB or more, so VM density and consolidation ratios never suffer from electrical instability. The low 1.35V operation compounds the benefit: in a fleet of 300 servers, the reduced thermal profile and power draw lower cooling overhead and keep available power budget within the rack envelope, directly shaving operating expense.

Finally, the dual-rank x4 organization delivers the memory-level parallelism that virtualized and database environments crave. A dual-rank DIMM interleaves accesses across two internal ranks, offering measurably higher bandwidth than single-rank alternatives at the same speed. For a heavily-threaded OLTP database where hundreds of concurrent queries are hammering the buffer pool, that extra throughput cuts response latency and prevents the memory controller from stalling. Together, these four features deliver the predictability, scale, and fault-resilience that server applications demand.

Endurance & Reliability

General Virtualization
For dense virtualization hosts using this 8GB RDIMM, populate at least six identical modules per CPU to enable balanced memory channels. With DDR3-1333 and low 1.35V operation, 48–64GB per socket comfortably supports 20–30 light VMs, while adding a second bank preserves dual-rank interleaving for steady latency under mixed loads.

In-Memory Database
Registered ECC memory is essential for data integrity, and the dual-rank x4 design delivers strong signal integrity in fully populated servers. Equip each node with 12–16 of these 8GB modules for 96–128GB, allowing large dataset caches without swapping; scale horizontally for Redis or Memcached clusters that demand consistent sub-millisecond response.

High Performance Computing
HPC memory per core matters: target 4–6 modules per NUMA node to feed dual-socket compute hosts with 64–96GB. Keep modules identical—mixing ranks or speeds destabilizes floating-point workloads. The 1.35V RDIMMs also reduce cumulative thermal load in dense racks, letting you sustain higher boost clocks during long CFD or weather simulation runs.

Verified Compatibility

Rigorously tested, compatible with Dell PowerEdge R720, HP ProLiant DL380p Gen8, and similar DDR3 servers.

FAQ