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CPU

If you know what you’re talking about with technology, then upgrading your computer can be a cheaper option than replacing it. And if your computer is more than three years old, it’s probably due an overhaul. When it’s time to start the upgrade, you are going to need a CPU. Where better to look for the one that is big enough for your needs than here on Kelkoo. You will find CPUs from a range of suppliers such as Amazon, eBay and Dell so you will be able to compare prices to make sure that you are getting the best possible deal. Not only that but we provide detailed product descriptions so you know exactly what it is that you are getting, and reviews from other users so you can make an excellent choice. If you’re a savvy shopper, make sure you check out what we have to offer before upgrading your CPU. ... View more - View less

View the CPU Buyers Guide

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  1. Refine your search

  2. Category

    1. CPU
    • Processor Type

      1. AMD Athlon (43)
      2. AMD Liano (21)
      3. AMD Opteron (69)
      4. AMD Phenom (26)
      5. AMD Sempron (12)
      6. Intel i3 (73)
      7. More...
    • Core

      1. Single Core (8)
      2. Dual Core (250)
      3. Triple Core (8)
      4. Quad Core (391)
      5. Six Core (25)
    • Budget

    • Brand

      1. AMD (196)
      2. Dell (510)
      3. Fujitsu Siemens (9)
      4. Intel (361)
      5. Lenovo (3)
    • Store

      1. eBay.co.uk (205)
      2. Dell Home E&A (136)
      3. Dell Business E&A (244)
      4. Amazon UK (292)
      5. Misco (46)
      6. Pixmania (13)
      7. More...

1180 Results from 7 retailers

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  1. Dell Xeon 5130 2.0GHz/4MB 1333FSB KIT
    • Dell Xeon 5130 2.0GHz/4MB 1333FSB KIT

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    • £390 Dell Business E&A
    • Dell Xeon 5130 2.0GHz/4MB 1333FSB KIT The 2.0 GHz Dual Core Xeon® Processor from Dell™; gives your...

    • £390
      inc P&P - £397
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  2. Dell Celeron D 430 (1.8GHz, 512KB, 800MHz FSB) Processor - Kit
    • Dell Celeron D 430 (1.8GHz, 512KB, 800MHz FSB) Processor - Kit

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    • £60 Dell Home E&A
    • Dell Celeron D 430 (1.8GHz, 512KB, 800MHz FSB) Processor - Kit This 1.8 GHz processor is designed for...

    • £60
      P&P: Free
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Home E&A
  3. Dell Intel Xeon E5540 Processor - 2.53GHz, 8M Cache
    • Dell Intel Xeon E5540 Processor - 2.53GHz, 8M Cache

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    • £798 Amazon UK
    • Intel Xeon E5540 Processor - 2.53GHz, 8M Cache

    • £798
      P&P: Free
      Availability: On order • Delivered: Usually dispatched within 1 to 3 months
            Amazon UK
  4. AMD Bulldozer Fx-4 Quad Core 4100 Black Edition 3.60ghz (socket Am3+) Processor
    • AMD Bulldozer Fx-4 Quad Core 4100 Black Edition 3.60ghz (socket Am3+) Processor

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    • £81.98 eBay.co.uk
    • Consumables Audio Visual AMD Bulldozer FX-4 Quad Core 4100 Black Edition 3.60Ghz (Socket AM3+) Processor Quad...

    • £81.98
      inc P&P - £84.77
      Availability: In stock
        eBay.co.uk
  5. AMD FX-8150 Eight Core Processor - 3.60GHz, 8MB, L3 Cache, Socket AM3+
    • AMD FX-8150 Eight Core Processor - 3.60GHz, 8MB, L3 Cache, Socket AM3+

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    • £173.74 Amazon Marketplace
    • AMD FX 8150 36GHZ SKT AM3 L2 8MB 125W PIB FD8150FRGUBOX Components Processors

    • £173.74
      inc P&P - £177.73
      Availability: In stock • Delivered: Usually dispatched within 1-2 business days
          Amazon Marketplace
  6. Intel Core 2 Duo E7500 - 2.93 GHz, 3 MB L2 Cache, 775 Socket (boxed version)
    • Intel Core 2 Duo E7500 - 2.93 GHz, 3 MB L2 Cache, 775 Socket (boxed version)

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    • £99 Pixmania
    • This Intel Core 2 Duo E7500 processor is clocked at 2.93 GHz and will considerably improve the...

    • £99
      inc P&P - £106.20
      Availability: In stock • Delivered: 1-2 days • Best prices on over 1,300,000 references! IN STOCK! Next day and standard delivery options available.
          Pixmania
  7. Hypertec An Intel Equivalent 512Mb Dimm (Pc2-5300
    • Hypertec An Intel Equivalent 512Mb Dimm (Pc2-5300

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    • £20.99 Misco
    • Hypertec An Intel Equivalent 512Mb Dimm (Pc2-5300

    • £20.99
      inc P&P - £23.38
      Availability: In stock • Delivered: 2-3 Days
          Misco
      idis isis
  8. Dell Quad Core Opteron 2352 (2.1GHz, 2 MB, 95W) - Processor - Kit
    • Dell Quad Core Opteron 2352 (2.1GHz, 2 MB, 95W) - Processor - Kit

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    • £240 Dell Business E&A
    • Dell Quad Core Opteron 2352 (2.1GHz, 2 MB, 95W) - Processor - Kit The Opteron™; 2352 2.1 GHz Quad Core...

    • £240
      inc P&P - £247
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  9. Dell PE860 3070, 2.67GHz/4MB 1066 FSB (Kit)
    • Dell PE860 3070, 2.67GHz/4MB 1066 FSB (Kit)

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    • £450 Dell Business E&A
    • Dell PE860 3070, 2.67GHz/4MB 1066 FSB (Kit) The 2.66 GHz Dual Core Xeon® Processor 3070 from Dell™; is...

    • £450
      inc P&P - £457
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  10. Dell Additional Processor : Xeon X5355 (2.66GHz, 1333MHz FSB) (Kit)
    • Dell Additional Processor : Xeon X5355 (2.66GHz, 1333MHz FSB) (Kit)

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    • £1,279 Dell Business E&A
    • Dell Additional Processor : Xeon X5355 (2.66GHz, 1333MHz FSB) (Kit) The 2.66 GHz Quad Core Xeon® Additional...

    • £1,279
      inc P&P - £1,286
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  11. Dell Quad Core Opteron 2376 (2.3GHz, 6MB, 75W ACP) - Kit
    • Dell Quad Core Opteron 2376 (2.3GHz, 6MB, 75W ACP) - Kit

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    • £131.99 Dell Business E&A
    • Dell Quad Core Opteron 2376 (2.3GHz, 6MB, 75W ACP) - Kit The Dell™; Opteron™; 2376 2.3 GHz Quad Core...

    • £131.99
      inc P&P - £138.99
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  12. Dell Quad Core Xeon E5345 (2.33GHz, 2x4MB, 1333MHz FSB) Processor - Kit
    • Dell Quad Core Xeon E5345 (2.33GHz, 2x4MB, 1333MHz FSB) Processor - Kit

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    • £482.99 Dell Business E&A
    • Dell Quad Core Xeon E5345 (2.33GHz, 2x4MB, 1333MHz FSB) Processor - Kit The 2.33 GHz Quad Core Xeon®...

    • £482.99
      inc P&P - £489.99
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  13. Dell Intel Quad Core Xeon L5320 LV Processor (1.86GHz, 2x4MB, 1066MHz FSB) - Kit
    • Dell Intel Quad Core Xeon L5320 LV Processor (1.86GHz, 2x4MB, 1066MHz FSB) - Kit

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    • £340 Dell Business E&A
    • Dell Intel Quad Core Xeon L5320 LV Processor (1.86GHz, 2x4MB, 1066MHz FSB) - Kit The Intel® Xeon® L5320 1.86...

    • £340
      inc P&P - £347
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  14. Dell Quad Core Xeon X5460 (3.16GHz 2x6MB) 1333MHz FSB Processor - Kit
    • Dell Quad Core Xeon X5460 (3.16GHz 2x6MB) 1333MHz FSB Processor - Kit

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    • £1,330.99 Dell Business E&A
    • Dell Quad Core Xeon X5460 (3.16GHz 2x6MB) 1333MHz FSB Processor - Kit The 3.16 GHz Quad Core Xeon® Processor...

    • £1,330.99
      inc P&P - £1,337.99
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  15. Dell Intel Xeon E5507 Processor (2.26GHz 4C 4M Cache 4.80 GT/s QPI 80W TDP) Heat Sink to be ordered separately - Kit
    • Dell Intel Xeon E5507 Processor (2.26GHz 4C 4M Cache 4.80 GT/s QPI 80W TDP) Heat Sink to be ordered separately - Kit

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    • £339.99 Dell Business E&A
    • Dell Intel Xeon E5507 Processor (2.26GHz 4C 4M Cache 4.80 GT/s QPI 80W TDP) Heat Sink to be ordered separately...

    • £339.99
      inc P&P - £346.99
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  16. Dell 2x Opteron 8380 - Quad Core Processor (2.5GHz, 6MB, 75W ACP) - Kit
    • Dell 2x Opteron 8380 - Quad Core Processor (2.5GHz, 6MB, 75W ACP) - Kit

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    • £1,610 Dell Business E&A
    • Dell 2x Opteron 8380 - Quad Core Processor (2.5GHz, 6MB, 75W ACP) - Kit The Opteron™; 8380 2.5 GHz Quad Core...

    • £1,610
      inc P&P - £1,617
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  17. Dell Intel Xeon E5504 Processor (2.0GHz, 4M Cache, 4.86 GT/s QPI) with Heat Sink - Kit
    • Dell Intel Xeon E5504 Processor (2.0GHz, 4M Cache, 4.86 GT/s QPI) with Heat Sink - Kit

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    • £186.99 Dell Business E&A
    • Dell Intel Xeon E5504 Processor (2.0GHz, 4M Cache, 4.86 GT/s QPI) with Heat Sink - Kit The Xeon® Processor...

    • £186.99
      inc P&P - £193.99
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  18. Dell Intel Xeon E5503 Processor (2.00GHz 2C 4M Cache 4.80 GT/s QPI 80W TDP) Heat Sink to be ordered separately - Kit
    • Dell Intel Xeon E5503 Processor (2.00GHz 2C 4M Cache 4.80 GT/s QPI 80W TDP) Heat Sink to be ordered separately - Kit

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    • £239.99 Dell Business E&A
    • Dell Intel Xeon E5503 Processor (2.00GHz 2C 4M Cache 4.80 GT/s QPI 80W TDP) Heat Sink to be ordered separately...

    • £239.99
      inc P&P - £246.99
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  19. Dell Intel Xeon X3470 Processor (2.93GHz, 8M Cache, Turbo, HT) - Kit
    • Dell Intel Xeon X3470 Processor (2.93GHz, 8M Cache, Turbo, HT) - Kit

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    • £600 Dell Business E&A
    • Dell Intel Xeon X3470 Processor (2.93GHz, 8M Cache, Turbo, HT) - Kit The Xeon® Processor from Dell is...

    • £600
      inc P&P - £607
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  20. Dell Core 2 Duo E7300 (2.66GHz, 3MB, 1066MHz FSB, 65W TDP) - Kit
    • Dell Core 2 Duo E7300 (2.66GHz, 3MB, 1066MHz FSB, 65W TDP) - Kit

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    • £190 Dell Business E&A
    • Dell Core 2 Duo E7300 (2.66GHz, 3MB, 1066MHz FSB, 65W TDP) - Kit The Core™; 2 Duo E7300 2.66 GHz Dual Core...

    • £190
      inc P&P - £197
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  21. Dell Intel Xeon L5640 Processor (2.26Ghz 6C 12M Cache 5.86 GT/s QPI 60W TDP Turbo HT) Heat Sink to be ordered separately - Kit
    • Dell Intel Xeon L5640 Processor (2.26Ghz 6C 12M Cache 5.86 GT/s QPI 60W TDP Turbo HT) Heat Sink to be ordered separately - Kit

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    • £1,387.99 Dell Business E&A
    • Dell Intel Xeon L5640 Processor (2.26Ghz 6C 12M Cache 5.86 GT/s QPI 60W TDP Turbo HT) Heat Sink to be ordered...

    • £1,387.99
      inc P&P - £1,394.99
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  22. Dell Quad Core Xeon L5335 (2.0GHz, 2x4MB, 1333MHz FSB) Processor - Kit
    • Dell Quad Core Xeon L5335 (2.0GHz, 2x4MB, 1333MHz FSB) Processor - Kit

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    • £311.99 Dell Business E&A
    • Dell Quad Core Xeon L5335 (2.0GHz, 2x4MB, 1333MHz FSB) Processor - Kit The 2.0 GHz Quad Core Xeon® Processor...

    • £311.99
      inc P&P - £318.99
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  23. Dell Intel Xeon E5530 Processor (2.4GHz, 8M Cache, 5.86 GT/s QPI, Turbo, HT) with Heat Sink - Kit
    • Dell Intel Xeon E5530 Processor (2.4GHz, 8M Cache, 5.86 GT/s QPI, Turbo, HT) with Heat Sink - Kit

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    • £508.99 Dell Business E&A
    • Dell Intel Xeon E5530 Processor (2.4GHz, 8M Cache, 5.86 GT/s QPI, Turbo, HT) with Heat Sink - Kit The Xeon®...

    • £508.99
      inc P&P - £515.99
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
  24. Dell 2.66 GHz Dual Core Xeon 5150 Processor for Dell PowerEdge 2950 FS Server
    • Dell 2.66 GHz Dual Core Xeon 5150 Processor for Dell PowerEdge 2950 FS Server

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    • £749.99 Dell Business E&A
    • 2.66 GHz Dual Core Xeon 5150 Processor for Dell PowerEdge 2950 FS Server The 2.66 GHz Dual Core Xeon®...

    • £749.99
      inc P&P - £756.99
      Availability: In stock • Delivered: Usually Ships In: 24-48 Hours
      Dell Business E&A
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Buying Guide - CPUs

Kelkoo

What does CPU stand for?

Called the brain of the computer, a CPU is short for central processing unit and comprises of millions of transistors that make the computer parts function together as a system. Thin layers of these transistors on the CPU block electricity at a given voltage and allow it to pass at other voltages, enabling it to move from a non-conducting to a conducting state. All calculations, which are the basis of the working of a computer, take place within the CPU. In terms of computing power, the CPU is the most important element of a computer system.

A CPU is basically a multipurpose, programmable device which takes data in the digital form as the input, and processes it using instructions preset in the processor to produce the desired output. With processors becoming more and more compact, modern microprocessors are being used in a variety of electronic gadgets ranging from automobiles to cell phones.

The CPU manages the control units that determine the path of data, monitors the cache and registers for effective management of information via clock distribution management. The CPU is usually designed according to the capabilities expected of the system. A CPU is comprised of three parts: the arithmetic logic unit, which performs all arithmetic and logical operations; the control unit, which collates instructions from memory, decodes and executes them calling upon the ALU when necessary; and the registers, responsible for the storage units where chunks of data are stored for faster access.

Too hot to handle?

The processing power of computers is greatly enhanced with the use of a multi-core processor, which essentially refers to two or more individual processors (called cores in this sense) integrated together. Ideally, a dual core processor would be nearly twice as powerful as a single core processor. In practice, however, the performance gain is far less - only about 50% more due to imperfect software algorithms and implementation.

The clock rate determines the speed and performance of the CPU. A crystal oscillator controls the speed of the CPU operations. Therefore, replacing the crystal with another crystal that oscillates at twice the frequency will also make the CPU operate at twice the speed. However, this means that there will also be roughly twice the amount of heat generated that you’ll have to dissipate with a cooling fan.

Know before you buy

The search for the appropriate architecture that can make the CPUs tick faster and use less energy per clock cycle is always on. Continual innovation has resulted in the production of cooler CPUs that run at higher clock rates such as quad core and six core processors. The search is also on for newer designs that allow CPUs to run at the same or at lower clock rate as the older CPUs, but get more instructions completed per clock cycle. The clock rate of a processor can help you compare computer chips of the same processor family and generation, but not outside.

There are quite a few manufacturers and brands of CPUs in the market, but the most popular and high-performing CPUs come from the stables of Intel, AMD, and Dell. So, depending on your needs and requirements, select the right CPU that will provide you with the desired output.

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