P73446-K21 HPE 256GB DDR5-6400MHz PC5-51200 ECC Registered RDIMM Memory

HPE P73446-K21 256GB DDR5 Smart Memory — Product 

The HPE P73446-K21 is a high-capacity, enterprise-grade 256GB DDR5 Smart Memory module (1×256GB) engineered for modern servers and mission-critical systems. Built to deliver ultra-fast data throughput, industry-leading reliability and advanced error protection, this registered ECC memory module is ideal for data centers, virtualization hosts and memory-intensive workloads that require both scale and stability.

Key Selling Points

• High capacity: single 256GB module for maximum density with minimal DIMM slots used.
• Blazing bandwidth: DDR5-6400 MT/s (PC5-51200) for faster data movement and lower latency in parallel workloads.
• Enterprise reliability: ECC with Registered 3DS signaling and Smart Memory features for robust data integrity.
• Energy-efficient: optimized at 1.1V for improved power profile compared to legacy memory standards.
• Optimized timings: CL60 tuned for stability at high-speed operation.

Technical Specifications & Detailed Attributes

Product Identification

• Manufacturer: HPE
• Part Number: P73446-K21
• Model Name: 256GB DDR5 Smart Memory Kit

Memory & Performance Characteristics

• Storage Capacity: 256GB (single module — 1 × 256GB)
• Memory Type / Technology: DDR5 SDRAM
• Speed / Bandwidth: 6400 MT/s (DDR5-6400) — PC5-51200
• CAS Latency: CL60 (optimized for DDR5-6400 operation)
• Voltage: 1.1 V (low-voltage operation for power efficiency)
• Memory Rank / Organization: Quad-rank, x4 device organization
• Error Handling: ECC (Error-Correcting Code) for data integrity
• Registration: Registered (RDIMM) with 3DS support
• Form Factor: 288-pin DDR5 DIMM

Compatibility & Use Cases

Common Server Workloads

• Virtualization and hypervisor hosts (large VM densities)
• In-memory caching and real-time analytics
• High-performance databases and OLTP/OLAP systems
• AI/ML training nodes and inference servers that benefit from big memory footprints
• Enterprise file servers and virtualization-backed storage appliances

Platform Considerations

Designed for HPE server platforms that explicitly support DDR5 registered ECC memory and quad-rank modules. Always verify motherboard/BIOS compatibility and supported memory population rules in your server's technical documentation. Mixing ranks, voltages or speeds can lead to suboptimal performance or non-boot situations — follow vendor-qualified memory lists when possible.

Best Practices for Deployment

• Install identical modules in matched channels for optimal dual/quad-channel performance.
• Update server firmware (BIOS/UEFI) to the latest vendor release before deploying new DDR5 modules.
• Use HPE-qualified part numbers for warranty and support continuity.
• When scaling memory, consider thermal and airflow implications in high-density racks.
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HPE P73446-K21 256GB DDR5-6400MT/s Server Memory

The HPE P73446-K21 256GB Quad Rank X4 DDR5-6400MT/s PC5-51200 CL60 1.1V EC8 288-Pin Memory module is designed for modern enterprise servers that require extremely high capacity, fast memory bandwidth, and consistent reliability. As data-intensive workloads continue to grow across data centers, cloud infrastructure, and enterprise IT environments, organizations increasingly depend on advanced DDR5 memory solutions to maintain optimal system performance. This high-capacity server memory module offers an exceptional combination of speed, stability, and scalability that supports demanding computing environments.

Engineered specifically for enterprise-grade server platforms, the HPE P73446-K21 memory module provides a 256GB capacity in a single DIMM configuration. The module utilizes DDR5 architecture operating at 6400MT/s, delivering significantly higher bandwidth compared to previous DDR4 generations. With PC5-51200 memory speed classification, the module is capable of accelerating data processing, improving application responsiveness, and enabling faster virtualization workloads. Businesses running large-scale databases, virtualization clusters, high-performance computing systems, and AI-driven analytics can benefit from this powerful memory solution.

Advanced DDR5 Memory Architecture for Next-Generation Servers

DDR5 memory technology represents a major advancement in server memory performance and efficiency. The HPE P73446-K21 DDR5 module is built on this next-generation architecture, allowing data centers to achieve improved system throughput and optimized energy consumption. Compared with DDR4, DDR5 memory introduces higher data transfer rates, enhanced burst length, improved channel efficiency, and increased memory density.

With a transfer rate of 6400MT/s, this DDR5 memory module significantly enhances memory bandwidth, enabling faster communication between processors and system memory. This increased speed allows servers to handle larger workloads while maintaining low latency. Whether powering mission-critical applications, enterprise databases, or high-performance computing tasks, DDR5 memory ensures consistent and reliable performance across demanding environments. Higher bandwidth for faster data transfers, Improved power efficiency with reduced operating voltage, Enhanced on-module power management, Increased memory density for larger capacities, Optimized data burst length for improved performance, Advanced error detection and correction features.

Massive 256GB Capacity for Data-Intensive Workloads

One of the standout features of the HPE P73446-K21 server memory module is its massive 256GB capacity. Enterprise servers increasingly require high-capacity memory modules to support modern workloads such as virtualization, in-memory analytics, artificial intelligence processing, and real-time data processing. Large memory capacity allows servers to maintain more active data within system memory, reducing reliance on slower storage layers.

With a single 256GB DIMM, organizations can dramatically increase total system memory capacity while maintaining efficient server configurations. This is particularly beneficial in dense server environments where maximizing memory capacity per slot is critical. High-capacity memory modules allow administrators to scale memory resources while preserving expansion flexibility for future upgrades.

Quad Rank X4 Configuration for Enhanced Data Handling

The HPE P73446-K21 module features a Quad Rank X4 architecture designed to optimize memory performance and capacity in enterprise systems. Quad rank memory modules contain four independent groups of memory chips that can be accessed by the memory controller. This configuration allows servers to achieve higher effective memory density while maintaining consistent performance across large workloads.

The X4 chip configuration further improves reliability by distributing data across multiple memory chips. This design enhances error correction capabilities and helps maintain system stability even during heavy processing operations. Enterprise workloads such as virtualization platforms, database management systems, and cloud computing infrastructures benefit significantly from the balanced performance offered by quad rank memory architecture.

6400MT/s Speed for High-Bandwidth Performance

Speed is a critical factor in server memory performance, and the HPE P73446-K21 delivers impressive data transfer rates of 6400MT/s. This high-speed memory ensures that processors can quickly access the data they need, minimizing bottlenecks and improving overall system throughput. High memory bandwidth is especially important for modern multi-core processors that rely heavily on fast memory access.

The PC5-51200 classification indicates that the module provides up to 51.2GB/s of bandwidth per DIMM. This bandwidth capability allows servers to process larger volumes of data simultaneously, making the memory ideal for high-performance computing clusters, virtualization infrastructures, and enterprise analytics platforms.

Optimized CL60 Latency for Balanced Performance

Latency is another crucial element in memory performance. The HPE P73446-K21 memory module features CL60 latency, providing an optimal balance between high transfer rates and responsive data access. Lower latency ensures that the processor can retrieve stored data quickly, reducing delays in application processing and improving overall system efficiency.

In enterprise environments where multiple applications and services run simultaneously, balanced latency plays a vital role in maintaining consistent system responsiveness. With CL60 timing specifications, this DDR5 module offers predictable and stable performance across a wide range of workloads.

Energy Efficient 1.1V Operating Voltage

Energy efficiency is a major consideration for modern data centers. The HPE P73446-K21 DDR5 memory module operates at just 1.1 volts, significantly reducing power consumption compared with previous memory technologies. Lower voltage operation helps organizations manage energy costs while maintaining high performance.

Reduced power consumption also contributes to lower heat generation within server systems. Efficient thermal performance helps improve server reliability and prolongs hardware lifespan, which is essential in large-scale data center deployments.

EC8 Error Correction for Enterprise Reliability

Reliability is a critical requirement for enterprise server environments, and the HPE P73446-K21 memory module includes EC8 error correction technology. Error correction mechanisms help detect and correct memory data errors before they impact system performance or data integrity.

In mission-critical computing environments, even minor memory errors can lead to system instability or data corruption. EC8 error correction ensures that servers maintain consistent reliability while processing sensitive workloads such as financial transactions, scientific research data, and enterprise business applications.

288-Pin DIMM Form Factor for Server Compatibility

The HPE P73446-K21 memory module uses the industry-standard 288-pin DIMM form factor designed for DDR5 server platforms. This standardized design ensures compatibility with modern enterprise servers and workstation platforms that support DDR5 memory technology.

The 288-pin DIMM structure provides reliable electrical connectivity between the memory module and the motherboard. It also allows server manufacturers to design high-density memory configurations that maximize performance while maintaining system stability.

Enterprise Data Center Applications

The HPE P73446-K21 256GB DDR5 server memory module is ideal for large-scale data center environments where high memory capacity and fast processing speeds are essential. Data centers supporting cloud services, enterprise applications, and global digital platforms require robust hardware components capable of maintaining consistent performance under heavy workloads.

By providing high memory bandwidth and large capacity in a single DIMM, this module helps reduce system bottlenecks and improve application performance. Enterprises deploying containerized workloads, virtualization clusters, or distributed computing systems can leverage this memory module to enhance server responsiveness and scalability.

Ideal for Virtualization and Cloud Computing

Virtualization environments require large amounts of memory to host multiple virtual machines efficiently. The HPE P73446-K21 memory module provides the capacity and speed necessary to support dense virtualization environments where hundreds of virtual machines may run simultaneously.

Cloud computing platforms also benefit from high-capacity memory modules that allow service providers to allocate resources dynamically across multiple users and applications. Faster memory access improves the responsiveness of virtualized systems and enhances user experience for cloud-based services.

Support for Artificial Intelligence and Machine Learning

Artificial intelligence and machine learning workloads require high-speed memory to process large datasets efficiently. The HPE P73446-K21 DDR5 module provides the bandwidth and capacity necessary for training complex models and analyzing massive datasets in real time.

AI frameworks often rely on high memory bandwidth to feed data to processors and accelerators without delays. High-capacity DDR5 memory helps ensure smooth data flow, enabling faster training cycles and improved analytics performance.

Enterprise Database Optimization

Modern database systems require significant memory resources to maintain high transaction throughput and fast query performance. The HPE P73446-K21 memory module allows database servers to store more active data in memory, dramatically reducing disk access latency.

In-memory database technologies benefit particularly from large memory capacities. By keeping entire datasets in RAM, organizations can achieve faster query processing, real-time analytics, and improved business intelligence capabilities.

Scalable Infrastructure for Future Growth

As organizations expand their digital infrastructure, the need for scalable hardware becomes increasingly important. The HPE P73446-K21 DDR5 memory module supports future growth by enabling servers to reach higher memory capacities without requiring additional hardware upgrades.

By installing high-capacity memory modules today, businesses can future-proof their server infrastructure and ensure their systems remain capable of handling increasing workloads over time. This scalability helps reduce long-term IT investment costs while maintaining consistent performance across evolving workloads.

Quality and Reliability of HPE Server Memory

HPE server memory modules are engineered to meet strict enterprise reliability standards. The P73446-K21 memory module undergoes extensive validation and compatibility testing to ensure optimal performance with supported server platforms. This testing ensures that the memory module delivers consistent results in mission-critical environments.

HPE's commitment to quality ensures that enterprise customers receive dependable hardware components capable of supporting critical business operations. With rigorous testing procedures and enterprise-grade manufacturing standards, the P73446-K21 memory module provides long-lasting performance and reliability for demanding IT infrastructures.