P75958-001 HPE 256GB Quad Rank X4 DDR5-6400MHz PC5-51200 Memory

Understanding the P75958-001 HPE 256GB DDR5-6400MHz Registered Smart Memory Module

The P75958-001 HPE 256GB Quad Rank x4 DDR5-6400MHz PC5-51200 CL60 1.1V Registered 288-Pin Smart Memory represents the pinnacle of high-performance server memory technology. Specifically designed for enterprise-grade HPE systems, this module delivers unmatched speed, scalability, and reliability. Built to support modern workloads in data centers, AI training models, virtualization, high-performance computing (HPC), and database management, this smart memory module integrates the latest DDR5 innovations with Hewlett Packard Enterprise’s proprietary Smart Memory features.

Key Specifications of the P75958-001 Smart Memory

• Capacity: 256GB
• Memory Type: DDR5 SDRAM
• Speed: 6400 MHz (PC5-51200)
• Latency: CL60
• Rank: Quad Rank x4
• Voltage: 1.1V
• Form Factor: Registered DIMM (RDIMM), 288-pin
• Compatibility: HPE Smart Memory Certified

DDR5 vs DDR4: Generational Improvements in Server Memory

The P75958-001’s DDR5 architecture represents a significant leap forward from DDR4 in terms of bandwidth, efficiency, and architecture scalability. DDR5 enables higher data rates and memory density, which is essential for next-generation servers managing enormous volumes of data.

Performance Enhancements in DDR5 Technology

DDR5 memory modules like the P75958-001 support higher base frequencies and tighter timing controls. DDR5-6400MHz provides nearly twice the bandwidth of DDR4-3200MHz, significantly improving application throughput. For enterprise servers handling data analytics, virtualization, and memory-intensive simulations, this boost translates to measurable performance gains.

Increased Memory Bandwidth

With a theoretical bandwidth of 51.2 GB/s per module, the PC5-51200 classification of this HPE memory module ensures rapid data movement across subsystems. The quad rank x4 configuration further enables effective load balancing and maximizes throughput by interleaving memory accesses.

Enhanced Power Efficiency

Operating at just 1.1V, DDR5 memory consumes less power compared to DDR4 (1.2V), even while supporting higher speeds and denser configurations. This reduction in voltage helps lower overall thermal output and energy consumption, contributing to greener data centers and reduced total cost of ownership.

Architectural Changes in DDR5

DDR5 incorporates two independent 32-bit memory channels per DIMM, improving parallelism and allowing more efficient access to memory banks. This structural enhancement helps reduce latency bottlenecks and improves concurrency for multi-threaded workloads.

Benefits of Registered (RDIMM) Memory in Enterprise Servers

The P75958-001 is a registered memory module, commonly known as RDIMM. This means it includes a register that buffers the command and address lines between the DRAM and the memory controller. RDIMMs are preferred in enterprise applications due to their enhanced reliability, scalability, and error correction capabilities.

Stability Under Load

Registered DIMMs reduce the electrical load on the memory controller, allowing more memory modules to be installed on a single channel without compromising system stability. This makes the 256GB RDIMM ideal for use in large-scale virtualization environments or hyper-converged infrastructures.

Error Correction and Data Integrity

ECC (Error-Correcting Code) functionality built into the P75958-001 ensures that data integrity is maintained across all operations. Single-bit and multi-bit error corrections reduce the risk of system crashes, making it ideal for mission-critical applications such as real-time analytics and in-memory databases.

Scalability for Virtualized and Cloud Environments

High-density quad rank modules such as the P75958-001 are especially beneficial in environments running virtual machines (VMs) or containers. Their large memory footprint supports memory overcommitment, allowing for higher VM density per physical server.

Smart Memory Advantages: HPE's Proprietary Innovations

HPE Smart Memory is a proprietary memory validation and authentication technology that ensures only high-quality modules are used in HPE systems. The P75958-001 undergoes extensive qualification testing to ensure compatibility, performance optimization, and fault tolerance.

Optimized BIOS Interactions

When installed in HPE servers, Smart Memory modules like the P75958-001 are recognized by the BIOS and automatically tuned for optimal performance. This reduces manual configuration and ensures firmware-level support for advanced memory features.

Compatibility with HPE ProLiant Servers and Systems

The P75958-001 Smart Memory is officially qualified for use with a broad range of HPE Gen10 and Gen11 ProLiant servers. This includes rack, tower, blade, and composable infrastructure configurations. Always refer to the server’s QuickSpecs or memory compatibility matrix to ensure proper integration.

Recommended Platforms for the P75958-001

• HPE ProLiant DL380 Gen11
• HPE ProLiant DL560 Gen11
• HPE Synergy 660 Gen11 Compute Module
• HPE Apollo 6500 Gen11 Systems
• HPE Cray EX Supercomputing Platforms

Latency and Timing Considerations: CL60 in Context

The CAS Latency (CL60) of this memory module is tailored for the 6400 MHz data rate. While CL60 may appear high in isolation, it is proportionate to the clock cycles required at DDR5 speeds. Due to the higher transfer rates, effective latency remains within acceptable parameters for high-performance computing environments.

Latency Optimization for Workloads

Applications that require real-time processing or frequent memory access cycles—such as AI inferencing, financial transactions, and scientific computing—benefit from the tightly managed latency characteristics of this RDIMM.

Thermal Design and Operational Temperatures

The P75958-001 includes an integrated heat spreader and thermal sensor to ensure operational efficiency in dense data center environments. The lower 1.1V power draw reduces thermal stress, while the sensor enables real-time temperature feedback to the system firmware.

Importance of Efficient Cooling in High-Density Systems

Data centers with high rack density benefit from smart thermal design in memory components. Proper airflow and intelligent fan control, informed by Smart Memory telemetry, prevent thermal throttling and extend the lifespan of components.

Security Features and Authentication

HPE Smart Memory modules are embedded with unique identifiers that verify authenticity and prevent unauthorized hardware use. The P75958-001 supports secure memory module validation at boot, protecting systems against counterfeit or non-certified memory installation.

Firmware Integration for Secure Operation

The authentication features of Smart Memory are integrated with HPE iLO (Integrated Lights-Out) and system BIOS. Unauthorized modules are flagged during POST (Power-On Self-Test), preventing potential system instability or performance degradation.

Use Cases: Where the P75958-001 Shines

This 256GB RDIMM is not a general-use memory stick. It is purpose-built for enterprise environments where performance, reliability, and scale are paramount. Below are key use cases:

High-Performance Computing (HPC)

With massive bandwidth and low latency, this memory is ideal for scientific simulations, weather modeling, genomics, and real-time physics rendering.

Virtualization & VDI (Virtual Desktop Infrastructure)

High memory capacity supports thousands of virtual desktops per server node. Quad rank design enables greater VM density and performance isolation.

Artificial Intelligence and Machine Learning

Large memory pools are essential for AI model training and data ingestion pipelines. The P75958-001’s throughput enables faster epoch completion and training scalability.

Big Data Analytics

With big data engines like Apache Spark, HPE’s 256GB DDR5 RDIMM can hold larger data sets in memory, reducing I/O bottlenecks and improving batch processing performance.

Memory Channel Balancing

Populate DIMMs symmetrically across all available memory channels to maintain balanced throughput. Uneven configurations can lead to throttled memory access and inefficient memory interleaving.

Firmware Updates and BIOS Settings

Keep system firmware and BIOS updated to ensure full compatibility with DDR5 RDIMMs. HPE periodically releases updates that optimize memory training algorithms and enhance Smart Memory telemetry accuracy.

Future-Proofing with DDR5 Smart Memory

The P75958-001 HPE Smart Memory represents a major investment in forward-looking server infrastructure. As DDR5 becomes the new standard for server platforms, adopting this module ensures long-term platform stability and readiness for workloads of tomorrow.

Scalable Capacity Expansion

As your organization’s memory requirements grow, the 256GB quad rank design supports seamless scaling without replacing existing modules. Additional RDIMMs can be added incrementally to meet demand.