i would strongly recommend you to crossfire with reference card, for your own good, especially when you found that the current cooling is not enough, hence it won't be a pain in the ass for looking for a after market cooling, either for air or ESPECIALLY WATER COOLING, because i'm now having a DC II and i'm thinking of crossfire, due to the size of the card that use up to three slot, i'm not sure whether the CHV can really do that or not...... so please think carefully before you decide.