HP 504351-S21 8GB Memory
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HP 504351-S21 8GB 800MHZ PC2-6400 Ram SDRAM CL6 ECC Bulk

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Part Number#: 504351-S21
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Short Description:
504351-S21 8 Gigabytes(GB) 2X4GB 800 Megahertz (MHz) PC2-6400 CL6 Error correction code (ECC) Registered Dual Rank Double Data Rate 2 (DDR2) Synchronous Dynamic Random Access Memory (SDRAM) Dual In-line Memory Module (DIMM) Memory Kit for Server | Made by HP | New Bulk Pack
Product Condition:
New Bulk Pack
Warranty provided by ALLHDD.COM:
90 Days
Product Details of the HP 8GB 800MHZ PC2-6400 Ram

In the world of computer hardware, RAM (Random Access Memory) plays a crucial role in ensuring the smooth and efficient operation of a system. Among the various options available, the HP 504351-S21 8GB 800MHz PC2-6400 SDRAM CL6 ECC Registered RAM module stands out for its specific features and capabilities. In this detailed exploration, we will delve into the various aspects of this RAM module, breaking down its key specifications, functions, and benefits.

HP 504351-S21 RAM ModuleRAM

Random Access Memory, or RAM, is a type of computer memory that is used to store data that is actively being used or processed by a computer. Unlike storage devices such as hard drives or SSDs, 8GB RAM is volatile and loses its data when the computer is powered off. It acts as a temporary workspace for the processor, allowing for faster data access and manipulation.

HP 504351-S21

The HP 504351-S21 is a specific RAM module designed for use in servers and high-performance computing environments. Its designation, 8GB 800MHz PC2-6400, provides key insights into its storage capacity and speed capabilities.

Key SpecificationsCapacity: 8GB

The 8GB capacity of the HP 504351-S21 RAM module refers to the amount of data it can store and actively use at any given time. This capacity is significant for applications and processes that require large amounts of memory, such as virtualization or database management.

Speed: 800MHz

The speed, measured in megahertz (MHz), determines how quickly the RAM module can read and write data. A speed of 800MHz indicates a respectable level of performance, suitable for a range of computing tasks. Higher speeds generally result in better overall system responsiveness. The speed of RAM is measured in megahertz (MHz) and indicates how quickly the RAM can read and write data. In the case of the HP 504351-S21, the speed is 800MHz. This speed is indicative of the module's ability to handle data swiftly, contributing to the overall responsiveness of your computer.

PC2-6400 Standard

The term PC2-6400 refers to the memory's peak bandwidth in megabytes per second (MB/s). In this case, it implies a peak bandwidth of 6400 MB/s. This specification is crucial for understanding the data transfer capabilities of the RAM module, ensuring optimal performance in data-intensive tasks.

The designation PC2-6400 specifies the type of RAM and its peak data transfer rate. In simple terms, this RAM module falls under the DDR2 category, and the 6400 denotes a maximum data transfer rate of 6400 megabytes per second. Understanding the type is crucial for compatibility with the motherboard and other system components.

Error-Correcting Code (ECC)

ECC is a feature that enhances the reliability of RAM by detecting and correcting errors that may occur during data storage or retrieval. This is particularly important in server environments where data accuracy is paramount. The HP 504351-S21 being ECC registered ensures a more robust and dependable performance.

CL6 Latency

CAS Latency (CL) measures the delay between the request for data and the actual delivery. A CL6 latency indicates that this RAM module has a relatively low delay, contributing to faster data access. Lower latency is desirable for applications requiring quick response times.

Use Cases and ApplicationsServer Environments

The ECC feature and 8GB capacity make the HP 504351-S21 well-suited for server applications. Servers often handle multiple tasks simultaneously, and the reliability offered by ECC is crucial for maintaining data integrity.


Virtualization involves creating virtual instances of operating systems or applications. This process demands substantial RAM, and the 8GB capacity of this module is advantageous for running multiple virtual machines concurrently.

High-Performance Computing

In environments where computational power is paramount, such as scientific research or complex simulations, the 800MHz speed and 8GB capacity make this RAM module a valuable asset.

Technical Specifications

To gain a deeper understanding of the HP 504351-S21 RAM module, let's explore its technical specifications, providing insight into the internal workings of the module.

Form Factor: DIMM (Dual Inline Memory Module)

The RAM module follows the DIMM form factor, a standard design for memory modules that ensures compatibility with a wide range of computer systems. DIMM modules are easily recognizable by their dual-row configuration of pins.

Voltage: 1.5V

The RAM module operates at a voltage of 1.5V. This voltage level is standard for DDR2 SDRAM and contributes to the module's energy efficiency.

Compatibility: HP Servers

Designed specifically for HP servers, the 504351-S21 RAM module ensures seamless integration with compatible systems. It is important for users to verify the compatibility of the module with their specific HP server models.

Reliability: Tested and Certified

HP, as a reputable hardware manufacturer, subjects its RAM modules to rigorous testing procedures to ensure reliability and stability. The 504351-S21 module is likely to be certified for use in HP servers, assuring users of its quality.

Benefits of Choosing HP 504351-S21

Enhanced Reliability

The ECC feature ensures that any potential errors in data storage or retrieval are promptly detected and corrected. This is particularly important in critical computing environments where data accuracy is non-negotiable.

Improved System Performance

With an 800MHz speed and low CAS latency, the HP 504351-S21 contributes to faster data access and overall system responsiveness. This is beneficial for tasks that require quick computational turnaround.

Suitable for Multitasking

The 8GB capacity makes this RAM module well-suited for multitasking scenarios. Whether you're running multiple applications simultaneously or engaging in memory-intensive tasks, having ample RAM is crucial for smooth operation.

Versatility in Application

The 8GB capacity and robust performance of the HP 504351-S21 make it a versatile choice for a wide range of applications. From business workstations to home desktops and server environments, this RAM module can cater to diverse computing needs, providing a balance of capacity and speed for optimal performance.


The term "Registered" indicates that the RAM module uses a register to temporarily store data before it is transferred to the memory controller. This helps in reducing the electrical load on the memory controller, allowing for greater reliability and stability, especially in systems with a large amount of RAM.

Performance and CompatibilitySystem Performance Boost

The HP 504351-S21 8GB RAM module is designed to provide a substantial boost to system performance. With its generous capacity and high-speed specifications, it ensures that your computer can handle demanding applications and multitasking with ease.

Compatibility with Servers and Workstations

Given its ECC-registered nature, this RAM module is particularly suitable for servers and workstations. These environments often require higher levels of reliability and data integrity, making ECC RAM a preferred choice.

Compatibility with Motherboards

Before purchasing and installing the HP 504351-S21 RAM module, it's essential to ensure compatibility with your motherboard. Check the motherboard's specifications to confirm that it supports DDR2 SDRAM, has the necessary number of memory slots, and can handle the specified capacity and speed of the RAM module.

General Information about the HP 504351-S21
  • Manufacturer: HP
  • Part Number or SKU# 504351-S21
  • Type: Memory (RAM)
  • Memory Type: PC2-6400 Memory
Technical Information
  • Storage Capacity: 8GB
  • Memory Technology: DDR2 SDRAM
  • Number Of Modules: 2 X 4GB
  • Memory Speed: 800MHz DDR2-800/PC2-6400
  • Data Integrity Check: ECC Chipkill
  • Signal Processing: Registered
  • Cas Latency Timings: CL6
  • Ram Features: Fully Buffered
  • Platform Support: Proliant Server
  • Form Factor: 240-Pin DIMM
  • The HP 504351-S21 is compatible with the following proprietary HP Proliant Server Series:
  • Bl465c G5
  • Bl495c G5
  • Bl685c G5
  • Dl165 G5
  • Dl165 G5p
  • Dl185 G5
  • Dl365 G5
  • Dl385 G5
  • Dl385 G5p
  • Dl585 G5
  • Dl785 G5

Finally, the HP 504351-S21 8GB 800MHz PC2-6400 SDRAM CL6 ECC Registered RAM module is a robust and reliable memory solution for various computing needs. Its capacity, speed, and error-correction capabilities make it well-suited for server environments, virtualization, and high-performance computing tasks. Understanding its key specifications and benefits is essential for making an informed decision when upgrading or building a computer system.

Product Condition:
New Bulk Pack
Warranty provided by ALLHDD.COM:
90 Days

About New Bulk Pack Products

New Bulk Pack products come with clamshell boxes and do not have any manufacturer warranty. Many times manufacturers disassemble whole units to use parts or pulled from a new system. Typically, this product doesn't come with software or instructions unless indicated and no Manufacturer’s genuine warranty. You can take note these are not brand new products.


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