i just built a new htpc and i have a gigabyte 780g motherboard and a sapphire 3450 videocard and i cant figuer out how to do crossfire. in device manager both of the video cards are showing up. in the catalyst control center theres an option to enable crossfire but it doesnt do anything. the catalyst control center doesnt say anything about the 3200 video card. i really need help i couldnt find any help on ati's website or on google. this is my first time doing crossfire