To do this, the manufacturers employ a large number of tricks such as CPU scaling where a processor scales its power usage (and thus performance) to the tasks at hand. This presents a major challenge in balancing performance and power consumption.

There are four distinct categories that I classify for laptop computers, each with its own distinct purpose for those using them. To match these systems to the computing tasks you also want to select the proper processor.

Budget Laptops
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Budget laptops are those developed to provide a functional portable computer at low price point. This would also include the Chromebook category of computer that often use the lower performance processors. They use a wide range of processors because often they are based upon older processors that use to be found in higher end laptops or the newer low cost processors. All of the processors listed here should be able to do all the basic computing tasks including web browsing, email, word processing and presentation. They are also very capable at being used for digital playback as well. About the only thing that value system processors will not be able to do well is gaming and high-end graphics applications. Here are some of the processors to look for in this range:

AMD A4-5000 and Higher
AMD A6-5357M and Lower
AMD A8-5557M and Lower
AMD E1-2100 and Higher
AMD E2-3000 and Higher
Intel Celeron 1007U and Higher
Intel Celeron 2950M and Higher
Intel Core i3-3110M and Higher
Intel Core i3-4000M and Higher
Intel Core i5-3210M
Intel Core i5-4200U
Intel Pentium 2030M and Higher
Intel Pentium 3550M and Higher

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Ultraportables are systems that are designed to be as light and compact as possible yet powerful enough for most common business applications such as e-mail, word processing and presentation software. These systems are geared towards those people who travel a lot who want a system that is not very cumbersome. They are willing to sacrifice computing power and peripherals for portability. Ultrabooks are a new subcategory of these systems that are built on a specific platform defined by Intel. Below are the processors found in ultraportables:

A thin and light laptop is one that is able to perform pretty much any computing task at least on some level. These systems can vary widely in terms of their price and performance. They tend to perform better than those in the value category or ultraportables but they are smaller and more portable than the large media centric desktop replacements. Note that as ultraportable processors used in Ultrabooks continue to get better, many systems in this category are beginning to use processors found in the ultraportable category for extended battery life. Here are some of the processors that can be found in this category of laptops:

AMD A4-5000 and Higher
AMD A6-5350M and Higher
AMD A8-5550M and Higher
AMD A10-5750M and Higher
Intel Core i3-3110M and Higher
Intel Core i3-4100M and Higher
Intel Core i5-3210M and Higher
Intel Core i5-4300M and Higher
Intel Core i7-3520M and Higher
Intel Core i7-3610QM and Higher