My friend get one i7 4790k and its FPO,ATPO is as follows.
FPO : l442b258ATPO : 2L427199A3479
I checked FPO on intel warranty web.
It says this cpu is i7 3770k.
This gets me confused.
So is this an Tray/BX i7 4790k or it is a fake cpu?
There is: http://ark.intel.com/products/65523/Intel-Core-i7-3770K-Processor-8M-Cache-up-to-3_90-GHz Intel® Core™ i7-3770K Processor (8M Cache, up to 3.90 GHz) Specifications
and there is: http://ark.intel.com/products/80807/Intel-Core-i7-4790K-Processor-8M-Cache-up-to-4_40-GHz Intel® Core™ i7-4790K Processor (8M Cache, up to 4.40 GHz) Specifications
If running windows, just right-click on Computer (or This PC), and select Properties. Then, read the screen. It will tell you the processor model number/
This is the Hello from Aaron Janagewen,
Nobody wants a remarked processor from Intel, and Intel does not want that to, I believe! I think you'd better make a contact support with Intel, http://www.intel.com/content/www/us/en/support/contact-support.html Contact Support . That might save your time and energies! Before doing that, I suggest you use the Intel official tool to obtain some useful information on your processor, https://downloadcenter.intel.com/download/7838 Download Intel® Processor Identification Utility - Windows* Version . You might also need a diagnostic tools from Intel to verify your processor too, https://downloadcenter.intel.com/download/19792/Intel-Processor-Diagnostic-Tool .
After you doing that, if you are still confuse about your processors. Per the information what Intel supporting people give you, you might possible contact with the vendors to seek a reasonable and fair way, such as refund or something else.
The FPO l442b258 belongs to an http://ark.intel.com/products/65719/Intel-Core-i7-3770-Processor-8M-Cache-up-to-3_90-GHz Intel® Core™ i7-3770 Processor (8M Cache, up to 3.90 GHz) Specifications; however, the ATPO 2L427199A3479 does not match this processor.