i get 1 year of guaranty, but i mean, is there any way the cards could be fake?
You're asking us if we think they could be fake? Of course they could be fake. Do you know who you're getting them from? If it's not Newegg or tigerdirect or some major retailer, then it's obviously a possibility that it's a scam.
But if it comes with a one year warranty, then it should be a safe bet.