hello i currently own 2 of the evga gtx 670 sc 4gb cards i was wandering if it would be worth selling them to buy a single evga gtx 780 duel ftw acx 3gb card then later in the future buy a 2nd for sli I would probably have to throw some extra money which i don't mind only given that the performance increase would be significant i run 3x 24" 1920x1080 monitors in surround as well with a total resolution of 5760x1080.