The easiest way to tell if you have an Intel ES Processor is to look at the processor topside markings. If you have a 4 or 5 digit Qspec listed like the one pictured below, you have an engineering sample. A production processor will have a 5 digit sSpec, usually beginning with S, such as SLB9L on the topside markings.
If no ink or laser markings are found, the processor may be an "unmarked" Intel ES Processor. Contact Intel if you are in possession of an unmarked Intel ES Processor.
The Intel® Processor Identification Utility can also be used to help identify whether a particular processor is an Intel ES processor.
Once you install and run Processor ID on an Intel ES Processor, the following message will appear in the text box:
"The following Intel processor appears to be an engineering sample, not a production processor. The utility is designed to support Intel production processors only. Sample processors are not warranted by Intel and are not intended for resale."