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Intel > 
Item#: N82E16819117147

Intel Xeon E5420 Harpertown 2.5GHz 12MB L2 Cache LGA 771 80W Processor BX80574E5420A

  • 1333MHz FSB
  • 45 nm Harpertown
  • 12MB L2 Cache
  • 80W
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The Quad Core Xeon E5420 processor delivers impressive performance, up to 4 times that of the earlier generation single-core processors. A massive 12MB of L2 cache increases the efficiency of cache-to-core data transfers, maximizing memory to processor bandwidth and reducing latency. The 64-bit cores are designed to handle all of today’s x86 32-bit software with ease and can effortlessly migrate to 64-bit software.

You also get Intel Virtualization Technology hardware enhancements that support software-based virtualization. It works with VMware, Virtual PC and XenSource, as well as virtualization products from an increasing number of software vendors. Virtualization combined with multiple cores gives you maximum power and performance per clock cycle.

  • newegg Quad-Core Processing with 12MB L2 Cache The Intel Xeon E5420 processor features four complete processor cores in one physical package. Significant performance headroom, especially for multi-threaded applications, helps boost system utilization through virtualization and application responsiveness. Its 12MB (2 x 6MB) L2 cache increases efficiency of L2 cache-to-processor data transfer, maximizes main memory to processor bandwidth and reduces latency.
  • newegg Supports Intel Virtualization Technology (Intel VT) With Intel VT, one hardware platform functions as multiple “virtual” platforms. For business, Intel VT offers improved manageability, limiting downtime and maintaining worker productivity by isolating computing activities into separate partitions. In the home, Intel VT allows creating unique user environments for multiple family members using the same platform simultaneously.
  • newegg Intel Extended Memory 64 Technology (Intel EM64T) Intel EM64T enhances next-generation IA-32 platforms with 64-bit addressability and related instructions, allowing flexibility for both 64-bit and 32-bit applications and operating systems.
  • newegg Execute Disable Bit (EDB) Intel's Execute Disable Bit function can prevent certain classes of malicious "buffer overflow" attacks when combined with a supporting operating system. Execute Disable Bit allows the processor to classify areas in memory where application code can execute and where it cannot. When a malicious worm attempts to insert code in the buffer, the processor disables code execution, preventing damage or worm propagation.
  • newegg Enhanced Intel SpeedStep Technology (EIST) EIST allows the system to dynamically adjust processor voltage and core frequency to decrease average power consumption and average heat production. Combined with existing power saving features, EIST may provide an excellent balance between providing power when you need it and conserving power when you don’t.

Learn more about Xeon E5420



CPU Socket Type

CPU Socket Type
LGA 771

Tech Spec

Core Name
# of Cores
Xeon E5420
Operating Frequency
L2 Cache
Manufacturing Tech
45 nm
64-Bit Support
Virtualization Technology Support
Multimedia Instruction
0.95V - 1.225V
Thermal Design Power
Cooling Device
Heatsink and Fan included

Manufacturer Warranty

3 years limited
3 years limited

Quick Info


  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years

Customer Reviews of Xeon E5420

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  • Bernie C.
  • 6/2/2009 3:23:36 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsGood for virtualization environment

Pros: I have two of these CPU's on a Lenovo D10 running W2k8 x64 R2 16 MB FBDIMM with 4 low load VM's under hyper-v. Two VM's are W2k8 servers and 2 VM's are PC's. The CPU's handle it well.
The fan noise is low.
Installation is easy. There are two components: the CPU chip itself and the active/pasive heatsink combo...just follow 10-12 diagrams on the installation booklet and you're done.
The heat sink comes with 3 stripes of pre-applied thermal material.

Cons: None.

1 out of 1 people found this review helpful. Did you? Yes No

  • Connor R.
  • 4/27/2009 2:06:33 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsBest PRICE/PERFORMANCE Processor

Pros: - Fast processors out of the box
- OC'd to 3.2ghz easily in BIOS without having to up power at all.
- Works GREAT with Skulltrail (D5400XS) Motherboard
- I bought two: 8 cores = awesome for After Effects / Premiere Pro video editing!

Cons: None

Other Thoughts: I might buy the L5420's now that they are out (lower power consumption @ 50W instead of 80W, but same speed as these E5420's)

Did you find this review helpful? Yes No

  • Kyle A.
  • 10/22/2008 11:48:03 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggslovely processor

Pros: Wicked fast relatively economical quad-core processor. My board has two sockets but I haven't seen a need for a second, no matter what I throw at this one.

Cons: Not a native quad-core, though not really an issue. No QPI yet.

Other Thoughts: Paired this proc with a Tyan S5396 and 8GB of Kingston DDR2-667. Running several virtual machines w/ various apps under a *nix host is absolutely no problem for it.

I also noticed a significant lack of third-party cooling solutions, but I found a quiet one by thermalright that works great.

10 out of 10 people found this review helpful. Did you? Yes No

  • Wayne S.
  • 5/16/2008 9:02:19 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggs8 Cores is better than a bushel of apples

Pros: Added this to my xw6600 workstation along with 8GB FB DDR2. Very fast with Vista Business 64bit. Solid Works much faster.

Cons: It was the Democrats time to shine and they give us the 2 stooges to choose from. What a waste of great opportunity & timing.

Other Thoughts: I'm voting for Pat Paulsen

11 out of 65 people found this review helpful. Did you? Yes No

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Home > 
Computer Hardware > 
CPUs / Processors > 
Processors - Servers > 
Intel > 
Item#: N82E16819117147
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