AMD now offers AMD Catalyst beta version 15.6 drivers for Windows 7 and Windows 8.1, which include the promised optimizations for Batman: Arkham Knight. They note that they've crossed out Crossfire support until they've worked things out: "AMD Crossfire support is currently disabled for Batman™: Arkham Knight while AMD works closely with Warner Bros. Interactive Entertainment to resolve the issue. An update for this issue will be released as soon as it is available."