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Same problem here. Error 12. It says, I don't have enough ressources and should deactivate other devices. I guess it means that I should deactivate the built-in Radeon card. But I guess, when I do that, my iMac display will turn black, without the external display turning on, leaving me without any display, so I didn't try that one. Gladly, I use the boot camp only for gaming purposes, and for these, the built-in card does have enough performance. Could be more, but it's enough. I mainly need the card as a CUDA accelerator while working on MacOS. And that works. I even found out that, under MacOS, I just have to say "hibernate" to get back my full screen resolution. If I don't, I have only 2500x2500 or something. And I can only set one resolution for both displays, ie one gets huge or the other one tiny. I'd actually like to sue that Gravis guy who told me there are no compatibility problems any more concerning boot camp and yes, AMD graphics is just as good as nVidia. Shouldn't have listened.

I have an iMac 5k late 2015 that I use for graphics production and have added an evga nvidia gtx 980 ti via AKiTiO adapter to it as Cuda accelerator. I ran the script to get the newest driver and everything shows up correctly in the systems panel and information. But since I installed the driver, my internal display's size is just half of the screen. What can I do? EDIT: the iMac also has problems with booting and shutting down. I always have to push the power button long for turning it off, and when I want to boot, u have to try 5+ times until I hear the startup sound, while the fans keep going. Suggestions?