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| Product Type | Memory Module |
|---|---|
| Compliance Standards | RoHS |
| Memory Capacity | 4 GB |
| Memory Technology | DDR3 |
| Product Voltage | 1.5V |
| RAM Speed | 1866MHz |
| RAM Standard | DDR3-1866/PC3-14900 |
| Error Identifying | ECC |
| Signal Type | Unbuffered |
| Column Access Strobe (CAS) | CL13 |
| Rank | Single Rank x8 |
| Quantity of Pins | 240-pin |
| RAM Genre | UDIMM |
This Unbuffered ECC UDIMM with single-rank x8 organization and CL13 latency is best suited for entry-level servers or small-office NAS platforms running memory-intensive, data-critical workloads such as light virtualization or file-sharing services. Its ECC error correction and dedicated 240-pin unbuffered signal path deliver strong data integrity and stable operation at DDR3-1866 speeds, while the single-rank configuration reduces electrical loading for improved compatibility with lower-capacity server chipsets.
1. Error-correcting code memory safeguards transactional data integrity, preventing silent data corruption that could disrupt critical server workloads.
2. Unbuffered signal path reduces command latency, boosting responsiveness in lightweight server applications where every microsecond counts.
3. Compact four-gigabyte capacity serves as a cost-effective building block for entry-level servers, enabling precise memory allocation for dedicated light tasks like web serving and DNS.
4. Eighteen sixty-six megahertz clock speed raises memory bandwidth, accelerating data-hungry server processes such as real-time analytics and in-memory caching.
5. Single Rank x8 organization ensures lower electrical loading on the memory controller, maximizing compatibility in dense multi-DIMM server configurations.
Designed for entry-level servers and workstations, the Micron MT9JSF51272AZ-1G9E2 is a 4GB DDR3-1866 Unbuffered ECC UDIMM that bridges the gap between pure consumer memory and high-end registered server modules. Its four defining characteristics directly address the needs of small business infrastructure and prosumer applications. First, ECC error correction eliminates single-bit memory errors in real time, preventing silent data corruption. In a virtualization host running multiple VMs or a ZFS storage server relying on in-memory checksums, this integrity means the difference between stable long-term operation and a gradual decay of critical data. Second, the Unbuffered architecture avoids the added clock cycle latency of registered modules, delivering faster command response. This directly boosts throughput for latency-sensitive tasks like a RAM-based database cache. Third, the 1866MHz clock speed provides peak bandwidth of 14.9GB/s, ensuring that simultaneous workloads, from containerized microservices to file sync jobs, never choke on memory contention. Finally, the Single Rank x8 organization places less electrical load on the memory channel compared to dual-rank alternatives, improving signal integrity and allowing the platform to sustain the rated frequency even when all slots are populated. For the operator of a 24/7 microserver backup appliance or a freelance engineer running nested virtual labs, these attributes translate into better workload consolidation, absolute data reliability, and lower total platform downtime without venturing into costly RDIMM ecosystems.
This 4GB DDR3-1866 ECC Unbuffered DIMM is server memory. Capacity planning guidance for typical workloads is provided below.
General Virtualization
Install eight identical modules (32 GB total) to support multiple VMs with dual- or quad-channel throughput and full ECC error correction. For test or light office virtualization, a 16 GB configuration using four modules works as a budget start—always populate channels in matched pairs.
In-Memory Database
Maximize capacity by filling every DIMM slot; a common 12-slot board delivers 48 GB for moderate Redis or Memcached instances where ECC protection is mandatory. If larger datasets are required, plan a migration to higher-density ECC UDIMMs (e.g., 8 GB) that retain the 1.5V and 1866 speed.
High-Performance Computing
Equip nodes with eight 4 GB modules (32 GB) distributed evenly across memory channels to achieve the full 1866 MT/s bandwidth essential for MPI workloads or simulation codes. Single-rank x8 DIMMs keep latency low; ensure the server platform explicitly supports ECC UDIMM at this frequency.
Rigorously tested, this ECC UDIMM is compatible with Dell PowerEdge T20, R220, HP ProLiant MicroServer Gen8, Lenovo TS140.
Q: Can I mix this MT9JSF51272AZ-1G9E2 with other memory modules of different brands or speeds?
A: Mixing is not advised. This 4GB DDR3-1866 ECC UDIMM operates at 1.5V with CL13. Combining it with different speeds or non-ECC modules typically forces the system to disable ECC or downclock, risking stability.
Q: Is this memory compatible with my server platform, such as Intel Xeon E3 or AMD Ryzen Pro?
A: This 240-pin DDR3-1866 ECC UDIMM suits Intel Xeon E3-1200 v2/v3 series and select AMD AM3+ platforms. Verify CPU and motherboard support for unregistered ECC memory at 1.5V before purchase.
Q: What is the recommended DIMM population order for optimal performance with this module?
A: For single-rank x8 UDIMMs like this, populate identical modules per channel starting from the farthest slot from the CPU. Refer to your server board's manual for specific slot numbering to maintain dual-channel ECC.
Q: Does this memory module support overclocking or XMP profiles?
A: No. As an enterprise DDR3-1866 ECC UDIMM, it adheres to JEDEC standards at CL13-13-13. XMP and overclocking are not supported, as error correction and stability take priority over speed manipulation.
Q: What warranty and typical failure rate can I expect for this module?
A: This module includes a one-year warranty. Typical annualized failure rates for Micron DDR3 ECC UDIMMs are extremely low, around 0.2–0.5%, thanks to rigorous testing and integrated error correction technology.