HPE 835955-B21 16GB Memory PC4-21300
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HPE 835955-B21 16GB Memory 2666mhz Pc4-21300 DDR4 SDRAM Cl19 New

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Part Number#: 835955-B21
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Short Description:
835955-B21 16 Gigabytes(GB) (1X16GB) 2666 Megahertz (MHz) Pc4-21300 Cl19 Error correction code (ECC) Registered Dual Rank X8 1.2v Double Data Rate 4 (DDR4) SDRAM 288-pin Rdimm Memory Module Proliant for Server | Made by HPE | Brand New 3 Years Warranty
Brand Warranty:
3 Years from the Manufacturer
Product Condition:
New Factory Sealed
Warranty provided by ALLHDD.COM:
90 Days
Product overview for the HPE 835955-B21

In the dynamic landscape of server technology, having the right memory module is crucial for optimal performance. One such module gaining attention is the HPE 835955-B21 16GB DDR4 SDRAM. In this comprehensive guide, we will delve into the intricacies of this memory module, exploring its features, specifications, benefits, and compatibility with Proliant servers.

Understanding the Basics DDR4 SDRAM: A Brief Overview

DDR4 Synchronous Dynamic Random-Access Memory (SDRAM) is the fourth generation of RAM technology widely used in computing devices, especially in servers. It offers improvements over its predecessor, DDR3, including increased speed, lower power consumption, and higher Memory module density.

HPE 835955-B21 16GB DDR4 SDRAM

The HPE 835955-B21 is a specific variant of DDR4 SDRAM designed for Hewlett Packard Enterprise (HPE) Proliant servers. Let's break down the product name to understand its key specifications:

  • Capacity: 16GB
  • Speed: 2666MHz
  • Type: ECC Registered
  • Rank: Dual Rank X8
  • CAS Latency: CL19
  • Voltage: 1.2V
  • Form Factor: 288-pin RDIMM (Registered Dual In-Line Memory Module)
Key Features and Specifications

The 16GB capacity ensures ample space for handling intensive workloads and multitasking. With a speed of 2666MHz, this memory module delivers fast and efficient data transfer rates, contributing to overall system responsiveness.

ECC Registered

Error-Correcting Code (ECC) is a crucial feature in server memory. ECC memory can detect and correct single-bit errors, enhancing the system's reliability and stability, which is especially critical in mission-critical applications.

Dual Rank X8

The dual-rank configuration signifies that the memory module has two sets of memory chips on each side, enhancing memory density without compromising performance. The X8 designation indicates the organization of the memory chips.

CAS Latency (CL19) and Voltage (1.2V)

CAS latency measures the delay between the initiation of a memory access and the actual data delivery. A CAS latency of 19 strikes a balance between speed and responsiveness. The low voltage of 1.2V aligns with modern energy-efficiency standards, contributing to reduced power consumption.

Form Factor: 288-pin RDIMM

The 288-pin Registered Dual In-Line Memory Module (RDIMM) form factor is designed specifically for servers. RDIMMs include a register that buffers memory addresses, reducing the load on the server's memory controller and allowing for greater module density.

Benefits of HPE 835955-B21 Memory Module

The 2666MHz speed, dual-rank configuration, and low CAS latency collectively contribute to enhanced server performance. This is particularly beneficial for data-intensive tasks and applications requiring quick data retrieval.

Reliability and Stability

The ECC Registered design ensures data integrity by detecting and correcting errors. In server environments where data accuracy is paramount, this feature adds an extra layer of reliability and stability.

Energy Efficiency

Operating at a low voltage of 1.2V, the HPE 835955-B21 promotes energy efficiency. This aligns with modern data center trends, where reducing power consumption is a key consideration for both cost savings and environmental sustainability.

Seamless Integration with Proliant Servers

Designed specifically for HPE Proliant servers, the HPE 835955-B21 ensures seamless integration, minimizing compatibility issues. This targeted compatibility simplifies the upgrading process for Proliant server users.

Compatibility with Proliant Servers

The HPE 835955-B21 memory module is explicitly designed to work with HPE Proliant servers. This includes compatibility with various Proliant server models, ensuring that users can easily integrate and upgrade their existing server configurations.

Precautions and Compatibility Checks

Before installation, users should follow recommended safety precautions, such as grounding themselves to prevent electrostatic discharge. Additionally, verifying compatibility with the specific Proliant server model is crucial to ensure optimal performance.


  • Step 1: Shut down the Server Ensure the server is powered off before attempting any installation or removal of memory modules.
  • Step 2: Locate Memory Slots Identify the memory slots on the server's motherboard where the new module will be installed.
  • Step 3: Insert the Module Gently align the notches on the memory module with those on the memory slot and firmly press down until the module clicks into place.
  • Step 4: Power On the Server Once the module is securely installed, power on the server and verify the new memory is detected.

Upgrading Considerations

When upgrading memory in a server, it's essential to consider the existing memory configuration. For optimal performance, maintaining a balanced memory configuration across all slots can be crucial. Consult the server's documentation for guidelines on memory population and configurations.

Memory Module Not Detected

If the newly installed memory module is not detected, consider the following troubleshooting steps:

  • Reseat the module to ensure it is properly seated in the memory slot.
  • Verify that the module is compatible with the server model.
  • Check for any physical damage to the module or the memory slot.

System Instability

If the server experiences instability after a memory upgrade, consider the following:

  • Ensure that the memory module is within the supported specifications of the server.
  • Check for firmware updates for both the server and the memory module.
  • Run memory diagnostic tests to identify potential issues with the new module.
General Information about the HPE 835955-B21
  • Manufacturer: HPE
  • Model Number or SKU# 835955-B21
  • Type: Memory (RAM)
  • RAM Type: PC4-21300
  • Product Name: 16GB DDR4 SDRAM Memory Module
Technical Information for the HPE 16GB DDR4 RAM
  • Storage Capacity: 16GB
  • Number Of Modules: 1 X 16GB
  • Memory Technology: 16GB DDR4 SDRAM
  • Bus Speed: 2666MHZ DDR4-21300/PC4-2666V
  • Data Integrity Check: ECC
  • Signal Processing: Registered
  • Cas Latency Timings: CL19
  • Rank Features: Dual Rank X8
  • Form Factor: 288-pin Rdimm
Compatibility of 16GB Memory Kit
  • HPE ProLiant BL Series: BL460c Gen10, DL360 Gen10, DL360 Gen10 Base, DL360 Gen10 Entry, DL360 Gen10 High Performance, DL360 Gen10 Low,
  • DL360 Gen10 Performance, DL380 Gen10, DL380 Gen10 Base, DL380 Gen10 Entry, DL380 Gen10 High Performance, DL380 Gen10 Performance, DL560 Gen10, DL560 Gen10 Base, DL560 Gen10 Entry, DL560 Gen10 Performance, DL580 Gen10, DL580 Gen10 Base, DL580 Gen10 Entry, DL580 Gen10 Performance Servers
  • HPE ProLiant ML Series:ML350 Gen10, ML350 Gen10 Base, ML350 Gen10 Entry, ML350 Gen10 Performance, ML350 Gen10 Solution, ML350 Gen10 Sub-Entry Servers
  • HPE ProLiant XL Series:XL170r Gen10, XL190r Gen10, XL230k Gen10 Compute Tray, XL450 Gen10 Servers
  • HPE Synergy 480 Gen10 Base Compute Module, 480 Gen10 Compute Module, 480 Gen10 Entry Compute Module, 480 Gen10 Performance Compute
  • Module, 480 Gen10 Premium Backplane Compute Module, 480 Gen10 Standard BackPlane Compute Module, 480 Gen10 w/o Drives Compute Module, 660 Gen10 Base Compute Module, 660 Gen10 Compute Module, 660 Gen10 Entry Compute Module, 660 Gen10 Performance Compute Module and 660 Gen10 Premium Compute Module

In short, the HPE 835955-B21 16GB DDR4 SDRAM memory module stands out as a reliable and high-performance solution for Proliant servers. With its optimal capacity, speed, and ECC Registered design, it addresses the demanding requirements of modern data center environments. When considering an upgrade to your Proliant server's memory, the HPE 835955-B21 proves to be a worthy investment, providing a seamless integration experience, enhanced performance, and a commitment to reliability.

Brand Warranty:
3 Years from the Manufacturer
Product Condition:
New Factory Sealed
Warranty provided by ALLHDD.COM:
90 Days

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