We strongly recommend buying Boxed Products only from Authorized Distributors. An Intel(R) Boxed Processor will be sold in a factory-sealed package and each processor carries a 3-year limited warranty.
The OEM processors are not individually packaged in a box, they do not include a thermal solution, and the warranty is set and honored by the vendor. The vendors are allowed to sell the processors directly to the consumers, and warranties can vary from vendor to vendor.
Normally the Processors are tested in factory. After testing, the unit may be marked on the metal surface and the golden contacts. However, Intel(R) confirms that all the units are released under the proper conditions and they should be working normally. Also, please bear in mind that the vendor may be testing the units.
Regarding the testing process in our facilities and the differences between factories, we cannot compare the products or quality between locations. Also, the information about the test performed in our facilities is confidential.