HP 819848-B21 Intel Xeon E5-2643 v4 3.40 GHz Processor

Name: HP 819848-B21 Intel Xeon E5-2643 v4 3.40 GHz Processor
Brand: HP
SKU: 819848-B21

Overview

The HP 819848-B21 is an HP-certified processor kit containing the Intel Xeon E5-2643 v4, a Broadwell-EP class hexa-core CPU built for workloads that benefit from high clock speeds per core. With a 3.40 GHz base frequency and 3.70 GHz turbo boost, the E5-2643 v4 is positioned for applications where per-thread performance outweighs raw core count — think database engines, financial analytics, and single-threaded legacy applications running on modern server hardware. The six cores with Hyper-Threading provide 12 threads total, offering enough parallelism for concurrent tasks without sacrificing the clock speed advantage.

As an HP-branded kit (indicated by the B21 suffix), this package includes the validated heatsink assembly matched to specific ProLiant Gen9 chassis designs, ensuring proper thermal management for the 135W TDP envelope. The QPI link speed of 9.60 GT/s supports efficient data movement between processors in dual-socket configurations and to system memory, which is critical for keeping the high-frequency cores fed with data. For administrators planning upgrades to existing HP ProLiant Gen9 servers who need clock-speed-oriented processing power, this kit provides a straightforward, vendor-validated path to improved performance.

Key Features

Processor Core: Hexa-core (6 Core) |Processor Socket:Socket R LGA-2011

Quick Path Interconnect :9.60 GT/s | Clock Speed:3.40 GHz Overclocking Speed:3.70 GHz

Thermal Design Power:135 W | Thermal Specification:75°C

Specifications

Manufacturer Part Number

819848-B21

Processor

Intel Xeon E5-2643 v4

Core Count

6 (Hexa-core)

Base Clock Speed

3.40 GHz

Turbo Clock Speed

3.70 GHz

Thermal Design Power

135W

Thermal Specification

75°C

Processor Socket

LGA 2011 (Socket R)

QPI Speed

9.60 GT/s

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Pros & Cons

👍 Pros

High 3.40 GHz base clock with 3.70 GHz turbo provides strong single-threaded and per-core performance for latency-sensitive applications.
Six cores with Hyper-Threading deliver 12 threads for balanced multi-tasking capability.
HP-certified kit ensures validated compatibility and includes the required heatsink for supported ProLiant servers.
QPI speed of 9.60 GT/s supports fast inter-processor and memory communication in dual-socket configurations.

👎 Cons

135W thermal design power generates significant heat, requiring adequate server cooling infrastructure.
Six cores is relatively modest compared to higher-core-count Xeon v4 options for heavily parallel workloads.
LGA 2011-3 socket limits this processor to Gen9 and equivalent era platforms with no forward upgrade path.
Premium pricing for HP-branded kits compared to purchasing a standalone OEM processor separately.

Frequently Asked Questions

Which HP servers is the 819848-B21 processor kit compatible with?

The 819848-B21 is an HP-specific processor kit designed for HP ProLiant servers using LGA 2011-3 (Socket R3) sockets, such as select DL360, DL380, and ML350 Gen9 models. Check HP's QuickSpecs for your specific server model.

Does this processor kit include a heatsink?

Yes, HP processor kits with the B21 suffix typically include the processor and the corresponding HP heatsink assembly required for proper thermal management in the target server chassis.

What is the difference between the 3.40 GHz base clock and 3.70 GHz turbo speed?

The 3.40 GHz base clock is the guaranteed operating frequency under sustained load. The 3.70 GHz turbo speed is reached automatically when thermal and power headroom allows, typically during lighter-threaded workloads where fewer cores are active.

Can two of these processors be installed in a dual-socket server?

Yes, the E5-2643 v4 supports dual-socket configurations. Both processors must be the same model for the server to operate correctly in a multi-CPU setup.