HP 604506-B21 8GB Dual Rank x4 Memory

Name: HP 604506-B21 8GB Dual Rank x4 Memory
Brand: HP
SKU: 604506-B21

An 8GB dual rank x4 server memory module from HP for boosting workstation and server capacity.

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Overview

The HP 604506-B21 is an 8GB server memory module built in a dual rank x4 configuration — a standard architecture for registered DIMMs used in HP ProLiant servers and compatible workstations. The dual rank design allows the memory controller to interleave operations across two ranks of chips, improving effective bandwidth under server workloads. The x4 chip organization is typical of enterprise-grade ECC memory, providing error correction that protects data integrity in always-on environments where reliability is critical.

As an HP-branded module sold in new retail condition, this DIMM has been validated and tested for compatibility with HP's server platforms, removing the compatibility guesswork that sometimes accompanies third-party memory. The 8GB capacity is suitable for incremental upgrades or for populating additional memory channels in systems that need more headroom for virtualization, databases, or application hosting. For administrators managing HP infrastructure, this module provides a reliable and vendor-supported path to expanding system memory.

Key Features

HP Compatible Part Number: 604506-B21

8GB PC3-10600 DDR3-1333 2Rx4 1.35v ECC Registered RDIMM

For HP Servers only. Not compatible with HP laptops and home computers.

Lifetime Warranty

Third Party; 100% Compatible

Specifications

Brand

Model

604506-B21

Capacity

8GB

Configuration

1 x 8GB

Rank

Dual Rank

Organization

Condition

New Retail

Pros & Cons

👍 Pros

HP-branded ensures tested compatibility with HP ProLiant server platforms
8GB capacity in a single DIMM preserves open slots for future expansion
Dual rank x4 organization supports higher memory bandwidth in multi-channel configurations
New retail condition provides full reliability without the uncertainty of used parts

👎 Cons

8GB per module is a modest capacity by current server memory standards
Compatibility is limited to servers that accept this specific DIMM type and configuration
Memory speed and generation (DDR3 vs DDR4) are not specified, requiring buyers to verify independently
Single-module purchase means matched-pair configurations require buying two separately

Frequently Asked Questions

What systems is the HP 604506-B21 memory module designed for?

This is an HP-branded server memory module. It is designed for HP ProLiant servers and workstations that accept dual rank x4 registered DIMMs. Check your server's QuickSpecs or memory configuration guide to confirm compatibility.

What does "Dual Rank x4" mean for this memory module?

Dual rank means the module has two sets of memory chips that the memory controller can access independently, which can improve throughput. The x4 designation refers to the chip organization — each chip provides 4 bits of data per access, a configuration common in ECC server memory.

Is this module ECC (Error-Correcting Code) memory?

HP's 604506-B21 is a server-class module with a dual rank x4 configuration, which is characteristic of registered ECC memory. Confirm your server's requirements before purchasing to ensure the correct memory type.

Can I mix this module with existing memory in my server?

Mixing memory modules is possible but can limit performance. For best results, use identical modules in matched sets according to your server's memory population guidelines.