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Perhaps the greatest feature integrated into X1950 Pro is internal CrossFire, which, finally, removes the need to purchase a specific master card and attachment via an external dongle, through DVI, for the most-efficient multi-GPU fun. ATI has integrated the compositing engine required for CrossFire on to the RV570 GPU itself, and two regular RV570s can be coupled together via a couple of SLI-like bridges for inter-card communication. Driver software then configures one card as master and the other, as you probably have guessed, as the slave.