Decided to return my gtx 670 because I was able to get my hands on a 690 for dirt cheap! Anywho what should I look for to make sure that this card is legit not some foreign knockoff. B/c I only have a certain allotted time to demand a refund and the day I get it I will be double checking everything. Second, do I need the retail box for the warranty? Or will it be void since I dont have the original box? The manufacturer is supposedly EVGA.