Myth: Crossfire works sort of like SLI, just throw in two (matched) cards.
Fact: You need a Crossfire master card for Crossfire, along with a board with the RX200 chipset.
thats sort of tru. several crossfire setups now work with matched cards, not a master and slave card. for example 2 x1300 or 2 x1600 dont need a master card.