General

Engineer's Note

This is a server-grade DDR3 Registered ECC memory module (RDIMM), ideally suited for legacy enterprise servers and workstations running memory-intensive workloads like virtualization or in-memory databases where data integrity is paramount. Its Registered signal architecture stabilizes high-capacity Quad Rank x4 configurations, and with CL5 latency it delivers reliable, deterministic performance in multi-DIMM server deployments.

Technical Specs & Insights

1. ECC detection and correction silently resolves single-bit memory errors, safeguarding financial transactions and critical databases from undetectable data corruption that could cause costly outages.
2. Registered signal buffering stabilizes command and address lines across fully populated server boards, enabling reliable operation even when all 24 DIMM slots are loaded for maximum memory scalability.
3. Quad Rank x4 organization quadruples the logical banks per module, dramatically increasing total memory density within limited server slots to host more virtual machines without sacrificing channel speed.
4. The 8 GB capacity per stick provides a dense building block for large memory pools, allowing hypervisors to allocate generous resources to each guest OS in consolidated environments.
5. CL5 latency minimizes the delay between a read command and data delivery, improving response times for latency-sensitive workloads like in-memory caching and OLTP databases under heavy query loads.

Why These Specs Matter

As a server memory specialist, the M393B1G70EM1-CF7 DDR3 RDIMM is engineered to overcome the critical reliability and performance challenges of data center environments. Its four defining features directly translate into tangible business outcomes. First, ECC protection corrects single-bit errors in flight, preventing silent data corruption in virtualized clusters where a random cosmic ray could destabilize multiple guest machines. Second, the Registered buffer stabilizes address and command signals when populating all DIMM slots, ensuring your hypervisor manages dozens of VMs without data integrity alerts due to signal degradation. Third, the Quad Rank x4 organization significantly boosts capacity within a single module and leverages extensive bank interleaving; this minimizes memory controller contention when running memory-hungry database caches and allows near-instantaneous page allocation in VDI workloads. Finally, the low CL5 latency at PC3-6400 speed yields faster access times for in-memory databases like SAP HANA or Redis, reducing transaction processing latencies and improving user-facing application responsiveness. This memory turns raw specifications into guaranteed uptime and accelerated query performance.

Endurance & Reliability

General Virtualization
For virtualization hosts, populate all memory channels symmetrically to maximize bandwidth. Using this 8GB DDR3-800 RDIMM, install at least six identical modules in a dual-socket system (three per CPU) to achieve 48GB total, ensuring balanced NUMA access and sufficient headroom for multiple VMs. If your hypervisor demands higher density, consider 16 or 24 modules depending on available DIMM slots, but keep configurations uniform across memory risers.

In-Memory Database
In-memory databases thrive on low latency and high capacity. Quad Rank x4 RDIMMs like this one can populate all channels, but be mindful of the server's maximum rank limits. For a typical two-socket server, install 24 of these 8GB Registered ECC modules (192GB total) across 12 DIMM slots per node to run a mid-sized Redis or Memcached instance comfortably, while leaving room for growth. Limit modules per channel to two when using quad-rank DIMMs to avoid downclocking.

High Performance Computing
HPC workloads demand peak memory bandwidth over raw capacity. Use the minimum number of these 800MHz DDR3 modules per channel—ideally one DIMM per channel—to maintain full speed without throttling. Deploy 8 or 12 modules in a balanced dual-socket configuration to yield 64–96GB of error-correcting memory, which is sufficient for most MPI-based simulations while preserving the low latency required for tightly coupled parallel tasks.

Verified Compatibility

Rigorously tested server memory, compatible with Dell PowerEdge R720, HP ProLiant DL380p Gen8, IBM System x3650 M4.

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