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Engineering samples are the beta versions of CPUs that are meant to be used as demonstrators. Usually, they are picked out of a very large bunch and perform well. However, they may have many flaws that were fixed in the production model. Old engineering models, such as Pentium IV ES chips were rare and favoured for having unlocked multipliers.[1] More recently, Core 2 ES chips have become more common and popular, many of which faulty processors, which could have only one core enabled, or low clocks. Sellers from Asia were selling volume purchased Core 2 ES chips at major profit. Engineering samples still can be almost identical to the release, however they all have less mature Core Steppings. A good Core 2 ES is usually just slightly slower than the OEM version. Some vendors sell good quality ES chips where many don't. Most Engineering samples have been put through extremely strenuous tests. ES chips are still legally their manufacturer's property, so therefore by purchasing Intel ES chips you are stealing from the manufacturer. Nonetheless, if the buyer is careful and purchases from a reputable vendor who has sold many ES chips, an ES chip may save the buyer quite a bit of money without losing too much performance.
Source : http://en.wikipedia.org/wiki/Engineering_sample_(CPU)
Engineering sample processors (also known as ES processors) are not intended to be offered for sale or resale to the general public. ES processors are considered "Intel Confidential" processors and are only to be used within Intel or by AUTHORIZED personnel outside of Intel for purposes of testing, evaluating, and/or pre-configuring systems. Every ES processor that is "Loaned" outside of Intel is done so under strict contractual agreements or Non-Disclosure Agreements (NDA) to assure the protection of Intel's intellectual property and the unit during the time it is "Loaned" out.
ES processors are available to those who qualify for, and obtain, an NDA. An Intel® Authorized Distributor can assist with the application to obtain an NDA. There are no other means to obtain sample processors from Intel Customer Support. Engineering sample processors are designed and built like normal processors, but offer additional features for testing purposes. These processors are not packaged or labeled for sale to consumers, and may incur damage when tested by system builders.
To determine if a processor is an engineering sample, refer to the processor markings. The Q-spec (a four-digit or five-digit code) will begin with the letter 'Q' instead of the standard letter 'S' which is used for production processors. Engineering Sample processors may also have the words ES located after the Q-spec or the words INTEL CONFIDENTIAL marked on them.
Engineering samples are not supported by Intel Customer Support and are not eligible for warranty service.
If you have received an engineering sample processor from a vendor, and you would like a production processor, contact your vendor for replacement information.
http://www.intel.com/support/process.../CS-030121.htm
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Source : http://en.wikipedia.org/wiki/Engineering_sample_(CPU)
Engineering sample processors (also known as ES processors) are not intended to be offered for sale or resale to the general public. ES processors are considered "Intel Confidential" processors and are only to be used within Intel or by AUTHORIZED personnel outside of Intel for purposes of testing, evaluating, and/or pre-configuring systems. Every ES processor that is "Loaned" outside of Intel is done so under strict contractual agreements or Non-Disclosure Agreements (NDA) to assure the protection of Intel's intellectual property and the unit during the time it is "Loaned" out.
ES processors are available to those who qualify for, and obtain, an NDA. An Intel® Authorized Distributor can assist with the application to obtain an NDA. There are no other means to obtain sample processors from Intel Customer Support. Engineering sample processors are designed and built like normal processors, but offer additional features for testing purposes. These processors are not packaged or labeled for sale to consumers, and may incur damage when tested by system builders.
To determine if a processor is an engineering sample, refer to the processor markings. The Q-spec (a four-digit or five-digit code) will begin with the letter 'Q' instead of the standard letter 'S' which is used for production processors. Engineering Sample processors may also have the words ES located after the Q-spec or the words INTEL CONFIDENTIAL marked on them.
Engineering samples are not supported by Intel Customer Support and are not eligible for warranty service.
If you have received an engineering sample processor from a vendor, and you would like a production processor, contact your vendor for replacement information.
http://www.intel.com/support/process.../CS-030121.htm
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