On the plus side, AMD's FreeSync display technology now boasts support for CrossFire, making smooth 4K gaming even more approachable--if not quite affordable enough to be adopted widely.
Had this been written before AMD's Catalyst 15.7 driver, which finally brings CrossFire support to FreeSync monitors, the bottom line would be murky. With that new driver support, however, the conclusion is clear. A pair of Radeon Fury cards in your system flat-out rocks, provided you're willing to pay a few extra pennies to the utility company and exercise patience when high-profile games are released without multi-GPU support.
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