Click to expand.You'd have to add the device ID of your card to the Info.plist both in AMD7000Controller.kext and AMDRadeonX4000.kext (located in /System/Library/Extensions), fix file permissions and rebuild kext cache (all of this can be googled). But:. This will violate the signature of the kexts, so you'd have to disable kext signing in Yosemite. In El Capitan you won't even be able to make this change with 'Rootless' in place, so you'd have to disable this. You'll have to repeat this with every OS X update since Apple likes to overwrite those kexts, even if they didn't change anything Long story short: Return the card, get something else. You'd have to add the device ID of your card to the Info.plist both in AMD7000Controller.kext and AMDRadeonX4000.kext (located in /System/Library/Extensions), fix file permissions and rebuild kext cache (all of this can be googled). But:.

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This will violate the signature of the kexts, so you'd have to disable kext signing in Yosemite. In El Capitan you won't even be able to make this change with 'Rootless' in place, so you'd have to disable this. You'll have to repeat this with every OS X update since Apple likes to overwrite those kexts, even if they didn't change anything Long story short: Return the card, get something else. The best Apple natively supported card so far is the GTX 680 / HD7950 (in both hardware and software).

These 2 cards have Apple licenced Mac Edition. Therefore, the software support for these 2 cards should not be a problem. However, the real Mac Edition card is very expensive (relatively), and won't do any better than other 3rd party PC card (apart from the PC card may only able to run at PCIe 1.0 speed). So, it's much better to buy your own card and flash it. For the Nvidia card, I don't know much about it.

But for the 7950 (also name as R9 280), a reference card should has 2 ROMs onboard, which is basically flash proof. The risk of bricking a card is extremely low (If you keep at least one ROM always in stock config). Anyway, if you want to flash a card, get the reference model, otherwise there is no guarantee it can work (or some port may not work properly after flash). The HD7970 also works well in terms of software because it share the same device ID as the D700. However, it require a 8 pin connection which do not exist in your Mac Pro. You can use a 6pin to 8 pin adaptor to solve the problem, but it means the 8pin can draw up to 200% power from the 6pin source (150W vs 75W).

If you don't care about this, then a 7970 (or R9 280X) should be a better choice in terms of performance. For Nvidia card, you can refer to the sticky thread. The 9xx card of course is a much better card, new tech, lower power consumption, better performance. But I still stay away from it at this moment because there is almost no native support from Apple. You must install the web driver from Nvidia and activate it before you install the card. And every single OSX update (even a very minor one) may break it and leave you a black screen to fix. Signal processing for mac. For budget tight condition.

You may consider to get a used 680 / 7950. I never own a 680, but for gaming, this should be a better choice than the 7950.

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