R520 will require master-cards when used in Crossfire

R520 will just as the R4xx-series require a master-card to work with the Crossfire-technology. There were hopes that the R520 would have all the necessary circuits for Crossfire but it seems the R520-development had gone too far when it realized what extra components it would need. In other terms it seems you will have to prepare for an external cable with the R5xx-series as well when running your regular card along side a master-card to use ATi’s multi-GPU technology.

Source: The Inquirer