825109-091 HPE 16GB DDR4 SDRAM 2666MHZ PC4-21300 ECC Registered 288-Pin RAM

HPE 825109-091 16GB DDR4-2666 PC4-21300 CL19 ECC Memory

DDR4 Registered DIMM Technology

Registered Memory Architecture Explained

The HPE 825109-091 represents the pinnacle of server memory technology with its advanced ECC Registered DDR4 architecture. Unlike unbuffered memory modules, registered DIMMs incorporate a register (or buffer) between the memory controller and the DRAM chips. This register buffers the command, address, and control signals, reducing the electrical load on the memory controller and enabling support for significantly higher memory capacities per channel. The 825109-091 utilizes a Registering Clock Driver (RCD) that synchronizes signal timing and ensures signal integrity across the entire module, making it possible to populate systems with large quantities of memory while maintaining stable operation at 2666MHz speeds.

Signal Integrity and Electrical Advantages

The registered design of the 825109-091 provides substantial benefits for large-scale memory configurations. By reducing the electrical load presented to the memory controller, systems can support up to three dual-rank or two quad-rank DIMMs per memory channel while maintaining rated speeds. This electrical optimization is particularly crucial in multi-socket server platforms where memory scalability directly impacts overall system performance and capacity. The 288-pin design incorporates advanced signal routing and power delivery optimization specifically engineered for high-frequency operation in demanding server environments.

Performance Specifications and Capabilities

Speed and Timing Characteristics

Operating at 2666MHz with a PC4-21300 designation, the HPE 825109-091 delivers exceptional memory bandwidth of 21,300 MB/s per module. The CAS Latency 19 (CL19) timing represents an optimal balance between speed and responsiveness for server workloads. The complete timing configuration typically operates at 19-19-19 cas latency with 1.2V operation, providing superior performance compared to lower-speed DDR4 modules while maintaining compatibility with Intel Xeon Scalable processors and compatible platforms. This speed grade represents one of the highest standard JEDEC specifications for DDR4 technology before entering overclocking territory.

Bandwidth and Throughput Analysis

With its 2666MT/s data rate and 64-bit data path, the 825109-091 achieves theoretical peak bandwidth of 21.3 GB/s per module. In multi-channel server configurations, this bandwidth aggregates significantly - a dual-processor system with twelve memory channels can achieve over 255 GB/s of total memory bandwidth when fully populated with these modules. This massive bandwidth is essential for memory-intensive applications including in-memory databases, virtualization, high-performance computing, and big data analytics where memory speed directly correlates to application performance.

Advanced ECC Error Correction

Single Device Data Correction (SDDC)

The HPE 825109-091 implements sophisticated Error Correcting Code technology that goes beyond basic single-bit error correction. The module supports Single Device Data Correction (SDDC), which can correct entire DRAM device failures in x4 configuration. This advanced ECC capability, sometimes referred to as Chipkill technology, provides protection against complete memory chip failures by spreading data across multiple chips with redundant information. This level of protection is crucial for mission-critical applications where even minimal downtime or data corruption is unacceptable, such as financial transaction processing, healthcare systems, and telecommunications infrastructure.

Patrol Scrubbing and Error

Beyond real-time error correction, the 825109-091 works in conjunction with supported server platforms to implement advanced error management features including patrol scrubbing. This background process continuously scans memory for errors and corrects them before they can accumulate and cause system issues. The memory controller maintains detailed error logs that track corrected error rates over time, enabling predictive failure analysis. When error rates exceed predetermined thresholds, the system can alert administrators through HPE's iLO management system, allowing for proactive maintenance during planned downtime windows.

HPE ProLiant Server Compatibility

Gen10 and Gen10 Plus ProLiant Systems

The HPE 825109-091 is specifically engineered for HPE ProLiant Gen10 and Gen10 Plus server platforms, including the DL380, DL360, DL580, and comparable models. These modules undergo extensive compatibility testing with Intel Xeon Scalable processors (Skylake, Cascade Lake, and Cooper Lake generations) to ensure optimal performance and reliability. The memory firmware includes HPE-specific parameters that enable advanced management features through iLO 5, including memory health monitoring, predictive failure alerts, and thermal management integration.

Platform-Specific Optimization

Each compatible HPE server platform includes specific memory population guidelines that optimize performance for the 825109-091 modules. These guidelines account for factors including memory channel architecture, processor socket configuration, and power delivery capabilities. For example, in HPE ProLiant DL380 Gen10 systems, optimal performance is achieved by populating memory in a balanced configuration across all available channels and processors. HPE provides detailed configuration tools and documentation to ensure proper implementation for each specific server model.

Memory Configuration Best Practices

Population Rules and Performance Optimization

For maximum performance, the 825109-091 should be installed in a balanced configuration across all memory channels. In dual-processor systems, this typically means installing identical quantities of memory per processor and ensuring symmetrical configuration across memory channels. Most HPE ProLiant servers support specific population sequences that optimize signal integrity and performance - typically starting with the white-colored slots in each channel. The registered design enables higher population densities than unbuffered memory, with support for up to 3 DIMMs per channel in many platforms while maintaining 2666MHz operation.

Mixed Configuration Considerations

While the 825109-091 can operate alongside other HPE-certified DDR4 memory modules, optimal performance is achieved using identical modules throughout the system. When mixing different memory types or capacities, the system will operate all memory at the speed and timing of the slowest module. Mixing registered and unbuffered memory is not supported in HPE servers, and mixing different rank configurations (single, dual, quad) within the same channel may impact performance or prevent operation at maximum speed. HPE's UEFI System Utilities provide validation and reporting of memory configuration during system initialization.

Performance Characteristics and Application Scenarios

Virtualization and Cloud Infrastructure

In virtualized environments, the 825109-091 provides the memory capacity and performance necessary for high-density virtual machine consolidation. The 16GB capacity per module enables flexible memory allocation across virtual machines, while the 2666MHz speed ensures responsive performance even during periods of high memory contention. The ECC protection with SDDC capability is particularly valuable in multi-tenant cloud environments where memory errors could impact multiple customers or applications. Performance testing demonstrates excellent scalability in VMware vSphere, Microsoft Hyper-V, and KVM virtualization platforms.

In-Memory Database Performance

For in-memory databases such as SAP HANA, Oracle Database In-Memory, and Microsoft SQL Server In-Memory OLTP, the 825109-091 delivers the combination of capacity, speed, and reliability required for enterprise deployments. The 2666MHz operating frequency reduces data access latency compared to lower-speed memory, while the large 16GB capacity per module enables substantial in-memory datasets. The advanced ECC protection ensures data integrity for critical business information, with error correction occurring transparently without performance degradation.

High-Performance Computing Applications

In high-performance computing environments, the 825109-091 provides the foundation for memory-intensive scientific simulations, financial modeling, and engineering analysis. The high bandwidth of 21.3 GB/s per module enables rapid data movement between processors and memory, reducing computation time for complex algorithms. The reliability features ensure that long-running calculations complete successfully without memory-related errors corrupting results. The modules demonstrate excellent performance in both scale-up and scale-out HPC architectures.

Cloud and Virtualization Infrastructure

In private cloud deployments, the 825109-091 enables high virtual machine density with consistent performance across diverse workloads. The memory modules support advanced virtualization features including memory overcommitment, transparent page sharing, and hot-add capabilities in supported platforms. The reliability features ensure high availability for business-critical services, while the performance characteristics support mixed workload environments including database, application, and web servers within consolidated infrastructure.

Specialized Applications

In healthcare environments, the 825109-091 provides the memory foundation for electronic health record systems, medical imaging platforms, and research computing. The ECC protection is particularly important for maintaining data integrity in patient records and research data, while the performance characteristics support rapid access to large medical images and analytical datasets. The modules comply with relevant healthcare industry standards for reliability and data protection.

Regulatory Approvals

The memory module complies with major international regulatory requirements including CE marking for the European Economic Area, FCC Part 15 for the United States, and various other national regulations. These certifications ensure that the product meets electromagnetic compatibility (EMC) and safety standards for use in commercial and industrial environments worldwide. The modules also comply with relevant telecommunications standards for network equipment applications.

Directive Compliance

The 825109-091 complies with the Restriction of Hazardous Substances (RoHS) directive and other environmental regulations limiting the use of specific hazardous materials in electronic products. This compliance demonstrates HPE's commitment to environmental responsibility and facilitates international distribution and deployment without regulatory restrictions. The modules are designed for recyclability at end-of-life, with materials chosen to support responsible disposal and recycling processes.