[Q] is my phone real?

I bought an used mi3w from an online store.
I checked the imei to know if it's real.And as the imei I have a decent Mi3w.
But coming home I installed cpu z and it shows that my phone have a Snapdragon 801!
I asked at the miui forum and they said I have a fake phone.
Then I did reset,ran benchmark and everything shows that I have an Mi3.

Now can anyone confirm that if is it an bug of the app or not?

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