There are a couple of other caveats with some after market cards too, for example a few cards need different power connectors or more power than there is available so require some fiddling with adapters etc, and I think from memory in the case of the 280X, it needs a hardware mod to achieve the full PCI link speed. It is an officially supported card in terms of drivers and will pretty much work out of the box on recent versions of OS X, but as kevinmcox mentions above, if the card doesn't originate from Apple you will have to get it flashed with the Mac EFI to be able to see the boot screens. I'm running a 2009 Mac Pro tower here and I've got an AMD Radeon R9 280X (3GB) card in it, works nicely with a Dell Ultrasharp at 2560x1440 and it will drive up to three displays quite happily.
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