There is three rows. One is the ID second shows the stepping and week of manufacture. The third is the serial. Mines has the serial laser engraved on the chip heat spreader. Also, on the box on the top i have a sticker with the serial. And last, on the manual, there is a section that says "Certificate of Authenticity" and at the bottom, you see a sicker with ther serial number. It is a 13 digit number. Hope this helps.