628975-181 HPE 32GB 1066mhz PC3-8500 Quad Rank DDR3 Memory.

HPE 628975-181 32GB DDR3 Memory Module

The HPE 628975-181 represents high-performance server-grade memory engineered for reliability in enterprise environments. This 32GB module utilizes DDR3 SDRAM (Double Data Rate 3 Synchronous Dynamic Random Access Memory) technology, which provides significant improvements over previous DDR2 generations in both bandwidth and power efficiency. The PC3-8500 designation indicates a peak transfer rate of 8500 MB/s, achieved through a 1066MHz I/O bus clock with effective double data rate operation.

Capacity: 32GB

Speed: 1066MHz

The speed of a memory kit plays a crucial role in determining the overall performance and responsiveness of a computer system. The HPE 628975-181 Memory Kit boasts an impressive speed of 1066MHz, offering users a significant performance advantage.

Enhanced Data Transfer Rates

One of the primary benefits of the 1066MHz speed is the enhanced data transfer rates it provides. With faster transfer rates, users can expect quicker access to their data, resulting in improved system responsiveness and reduced loading times. This is especially beneficial for users who frequently work with large files or engage in data-intensive tasks such as video editing or 3D rendering.

DDR3 Technological Advancements

DDR3 technology incorporates several architectural improvements over DDR2, including higher data rates, reduced power consumption (1.5V compared to DDR2's 1.8V), and enhanced signal integrity through features like dynamically calibrated output drivers and on-die termination. The prefetch buffer has been doubled to 8 bits, enabling the higher data rates that make DDR3 suitable for memory-intensive server applications.

Detailed Performance Specifications

Operating at 1066MHz with CAS Latency 7 (CL7) timing, this module offers optimized performance characteristics for enterprise workloads. The CAS Latency of 7 clock cycles represents the number of cycles between when a read command is issued and when the data becomes available, with lower CL values indicating faster response times. When combined with the 1066MHz data rate, this timing provides an optimal balance between bandwidth and latency for server applications.

Bandwidth and Real-World Performance

The theoretical peak bandwidth of 8500 MB/s is calculated as follows: 1066 million transfers/second × 8 bytes/transfer (64-bit data bus) = 8528 MB/s. In practical applications, actual throughput will vary based on system configuration, memory controller efficiency, and workload characteristics. The quad-rank architecture further optimizes performance in multi-processor systems by reducing electrical load on the memory bus.

ECC and Registered DIMM Technology

The HPE 628975-181 incorporates ECC (Error Correcting Code) technology, which is essential for mission-critical server environments where data integrity is paramount. ECC functionality detects and corrects single-bit memory errors automatically, while also detecting double-bit errors. This capability significantly reduces system crashes, data corruption, and silent data errors that can occur due to cosmic radiation, electrical interference, or component aging.

ECC Operation and Error Correction Mechanics

ECC implementation requires additional memory bits beyond the standard 64-bit data width. This module includes 8 extra ECC bits, creating a 72-bit total data width (64 data bits + 8 ECC bits). The memory controller uses these extra bits to store parity information that enables single-error correction and double-error detection. When a single-bit error is detected during a read operation, the memory controller automatically corrects the error before sending the data to the processor, ensuring data integrity without system interruption.

Registered DIMM (RDIMM) Architecture

As a Registered DIMM, 628975-181 this memory module includes address and command registers (typically implemented as registers or buffers) between the memory controller and DRAM chips. These registers buffer the address and command signals, reducing electrical load on the memory controller and enabling support for higher memory capacities per channel and more DIMMs per system compared to unbuffered modules.

Benefits of Registered Memory in Server Environments

The registered architecture provides several critical advantages for server systems: improved signal integrity by reducing electrical load on the memory controller, support for higher memory densities, and enhanced system stability with multiple installed modules. The slight additional latency introduced by the registers (typically one clock cycle) is negligible compared to the stability and capacity benefits in enterprise environments.

Performance Implications of Quad Rank Design

While quad-rank modules may operate at slightly lower frequencies than single or dual-rank modules in the same system due to increased electrical load, they provide significant advantages for memory capacity and overall system memory footprint. In many server configurations, the ability to populate systems with higher-density modules reduces the total number of DIMM slots required to achieve a given memory capacity, potentially lowering overall system cost and power consumption.

Compatibility

The HPE 628975-181 is engineered specifically for compatibility with Hewlett Packard Enterprise server systems that utilize the PC3-8500 memory standard. This module is validated for use in various HPE ProLiant Generation 7 and Generation 8 servers, including DL3x0, DL5x0, and BL4x0c blade models. Always consult the HPE compatibility matrix for specific system validation. Proper memory configuration is critical for optimal system performance. HPE servers typically require memory modules to be installed in specific slots and in balanced configurations across processor memory channels. For systems utilizing this 32GB module, follow HPE's memory population rules regarding rank balancing, channel organization, and processor socket memory allocation to ensure optimal performance and compatibility.

Operating Environment Specifications

This memory module is designed to operate within standard server environmental conditions, typically between 5°C to 85°C with appropriate airflow. The module includes thermal sensors (if supported by the system) for monitoring operating temperature and ensuring reliability under varying load conditions. Proper system cooling is essential for maintaining memory reliability, particularly in densely populated memory configurations.

Firmware

HPE genuine memory modules include necessary firmware and management information that integrates with HPE's iLO (Integrated Lights-Out) management system. This integration enables advanced memory monitoring, predictive failure analysis, and compatibility with HPE's service infrastructure for proactive maintenance.

Registered vs. Unbuffered DDR3

Compared to unbuffered DDR3 memory, registered DIMMs like the 628975-181 offer superior signal integrity, higher capacity support, and better stability in multi-DIMM configurations. While unbuffered memory may have slightly lower latency, registered memory is essential for server environments requiring high memory capacity and reliability.