when you boot up in the bottom, it says what revision you got, Also if I remember well in one of the corners says what revision you have, not sure tought, I have the manual somewhere on my home, when i get back from work I will take a look for you.
It'll be somewhere on the board, usually on the bottom left below the PCI slots or on the bottom of the last PCI slot (or ACR slot if it has one). I'm not familiar with the a7n8x tho.
You lucky dog! Mine was a 1.06. Oh well, when flashed, it can still use 400 fsb Good luck, it's been a great board for me! You can get all the wires and i/o plate from Asus for <$25 too.