General

Engineer's Note

This 8GB DDR3-1333 UDIMM with ECC and a dual-rank x8 organization is engineered for entry-level servers and workstations where data integrity is paramount, utilizing unbuffered ECC to correct single-bit errors without the overhead of registered logic. Its dual-rank configuration and CL9 latency deliver efficient interleaving and responsive performance, making it ideally suited for small business databases, file services, and virtualization hosts that demand reliable, low-cost memory expansion.

Technical Specs & Insights

1. ECC technology actively detects and corrects single-bit memory errors, safeguarding transactional data integrity for always-on server workloads where even silent corruption is unacceptable.
2. 8GB capacity per module strikes a density sweet spot, allowing mid‑range virtualization hosts to populate enough RAM for multiple VMs without immediately exhausting DIMM slots.
3. 1333MHz speed delivers a stable memory bandwidth of 10.6 GB/s, keeping database queries and web-serving latency low under consistent concurrent requests.
4. Dual Rank x8 organization supplies two addressable internal ranks per DIMM, increasing overall throughput via rank interleaving which helps maintain smooth performance as server memory channels fill up.
5. Unbuffered signal type eliminates the register latency found in registered DIMMs, giving single‑socket tower or entry‑level rack servers a modest latency advantage while keeping platform cost and power budget in check.

Why These Specs Matter

The M390B1G73BH0-1333 is an 8GB DDR3-1333 Unbuffered ECC UDIMM with a CAS latency of 9, a dual-rank x8 organization, and 1.5V operation, clearly positioning it as a server-class memory module designed for entry-level and mid-range server platforms. In virtualization clusters, where multiple VMs contend for physical resources, ECC becomes non-negotiable. A single-bit error caused by cosmic radiation can corrupt a hypervisor’s memory page, silently crashing dozens of business-critical workloads. The side-band ECC correction built into this module detects and corrects such errors in real time, directly translating to sustained uptime for virtualized infrastructures. The dual-rank configuration is another critical enabler: it allows the memory controller to interleave accesses across two internal ranks on the same DIMM, delivering measurably higher throughput for in-memory databases like Redis or for transient analytical workloads where microsecond latency spikes affect query consistency. The unbuffered design eliminates the register clock delay inherent in registered DIMMs, yielding a true CL9 latency that improves response times in latency-sensitive database operations. In a file server or light domain controller running continuous background integrity checks, the EU RoHS and FCC compliance ensures stable, consistent signal quality across 24/7 operation over years, avoiding subtle data degradation that plagues non-compliant modules. Together, these characteristics protect your data, reduce downtime from silent corruption, and deliver predictable performance where it matters most—keeping your business logic intact without costly interruptions.

Endurance & Reliability

General Virtualization
For virtualization hosts using DDR3-era platforms, populate two or four modules of this 8 GB ECC UDIMM to achieve a total of 16 GB or 32 GB. This configuration balances cost and density for light-to-moderate VM workloads running hypervisors like VMware ESXi or Proxmox on single-socket servers. Always install identical dual-rank modules in symmetrical pairs to maintain memory interleaving and stable ECC operation.

In-Memory Database
In-memory databases such as Redis or Memcached demand both capacity and data integrity. Deploying four of these 8 GB modules across all available channels (e.g., 4×8 GB for 32 GB total) maximizes bandwidth on quad-channel platforms. The ECC feature prevents silent data corruption, while the dual-rank x8 organization delivers lower latency under heavy read/write operations.

High-Performance Computing
HPC clusters benefit from the deterministic latency of DDR3-1333 CL9 modules. Fill every DIMM slot with identical 8 GB ECC UDIMMs to reach the node’s maximum supported capacity (typically 32 GB or 64 GB on single-socket boards). The low 1.5 V operating voltage reduces thermal load in dense compute nodes, and unbuffered ECC keeps access latencies minimal for tightly coupled parallel tasks.

Verified Compatibility

Validated for server use: compatible with Dell PowerEdge R320/R420, HP DL360e Gen8, Lenovo TS140, and similar.

FAQ