This allows users to run the dual GPUs as one single unit, albeit only within Windows at this point in time.
The 2013 Mac Pros, released late last year, come with dual GPUs as standard. In order to obtain a significant speed boost in frame rates for graphics heavy applications such as games, users can “fuse” the two GPUs together, AMD’s CrossFire enables them to effectively act as one single really fast graphics processing unit.*The only caveat is that this doesn’t work on OS X, users will need to be running Windows in the Mac Pro’s Boot Camp partition if they want to take advantage of CrossFire mode.*The accompanying graph clearly shows increase in performance with GPUs “CrossFired” on Windows 8.1.
The reason for support only existing for Windows is that AMD only supplies firmware and drivers for Linux, Windows XP, Vista and 7, not Mac. It remains to be seen if Apple intends to support CrossFire in the future, seeing as how all Mac Pros now come with dual AMD FirePro GPUs, there’s certainly nothing wrong in squeezing every bit of performance from the hardware under the hood.
Its still possible to take advantage of the dual GPUs on Mac even without CrossFire, developers have to add code in their apps to enable both GPUs, as Apple has configured the Mac Pro in a way that one GPU is setup for display whereas the other is used exclusively for GPU compute workloads.
Source: Barefeats
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