The sSpec number is also known as the specification number and SL code. It is a five character string (SL36W, XL2XL, etc.) that is printed on the processor for identification. The sSpec is typically found on the top side of the processor.
Processors within a family of the same speed can have different sSpecs. The reason is because when a processor stepping change occurs, a new sSpec is generated for that stepping. It is also true that the same stepping level can also have more than one sSpec associated with it.
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