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HP 507800-B21 Intel Xeon E5506 2.13GHz Quad-Core Processor — main product image
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HP 507800-B21 Intel Xeon E5506 2.13GHz Quad-Core Processor

Intel Xeon E5506 quad-core server processor for reliable performance in HP ProLiant environments.

$278.59*
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*Price sourced from Amazon.com. Last updated:Oct 27, 2026.Price and availability are subject to change — details.

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Overview

The HP 507800-B21 is an HP-branded processor kit featuring the Intel Xeon E5506, a quad-core server processor clocked at 2.13GHz. Built on Socket B (LGA 1366), this chip was designed for entry-level and mid-range server workloads, offering four physical cores without hyper-threading. It includes 1MB of L2 cache and 4MB of shared L3 cache, with a QPI interconnect speed of 4.80 GT/s for communication with the rest of the system. As an HP kit, it is packaged with the necessary heatsink and mounting hardware for drop-in installation in compatible HP ProLiant servers.

This processor is best understood as a maintenance and replacement part for organizations still running HP ProLiant servers on the LGA 1366 platform. It supports both 64-bit and 32-bit operating environments, making it compatible with a range of server operating systems. While its specifications are modest by today's standards, the E5506 remains a functional and affordable option for keeping legacy servers operational, handling light virtualization, file serving, or basic application hosting where upgrading the entire server platform is not yet justified.

Key Features

Intel Xeon Dp Quad-core E5506 2.13ghz - Processor Upgrade - 2.13ghz - 4.8gt/s Qpi - 1mb L2 - 4mb L3 - Socket B Lga-1366 - Rohs Compliance

Specifications

Brand
HP
HP Part Number
507800-B21
Processor
Intel Xeon E5506
Cores
4 (Quad-Core)
Clock Speed
2.13GHz
QPI Speed
4.80 GT/s
L2 Cache
1MB
L3 Cache
4MB
Socket Type
Socket B (LGA 1366)
Processor Type
Intel Xeon DP

Frequently Asked Questions

This is an HP-branded processor kit (part number 507800-B21) designed for specific HP ProLiant servers that use Socket B (LGA 1366). Check HP's compatibility list for your server model before purchasing.
The E5506 has 1MB of L2 cache for fast, frequently accessed data and 4MB of L3 cache shared across all four cores for broader data access. Together they reduce the need to fetch data from slower main memory.
No, the Intel Xeon E5506 does not support hyper-threading. It provides four physical cores and four threads.
The QPI (QuickPath Interconnect) speed is 4.80 GT/s, which determines how fast the processor communicates with other system components like memory and I/O. This is an entry-level QPI speed within the E5500 series.
This is an HP-branded processor kit (507800-B21). Availability as new or refurbished depends on the seller, so verify the condition before purchasing.

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