i have this card, the gtx 660 dc2 2gd5, and my brother's pc has the dc2o 2gd5 version, and since i have a high end card, we want to put those 660's in SLI at his pc, we checked and his mobo supports SLI but the cards are not the same, will they connect in SLI or do we need 2x dc2o 2gd5?