Hello community Macrumors, I am on a Mac Pro 2010 6 cores, equipped with a GTX 780 and a GT 640, which I use for architecture and 3d. In common use, there is no problem. Everything works relatively well. However, when I solicit the graphics card, with Octane render in particular, the computer crash regularly. So much so that it becomes difficult for me to finish a rendering. The GTX 780 is on an auxiliary power supply, as a precaution (but not a handyman, I have to leave the chassis between open, because of the cables of the power supply). These repeated crashes during intensive use of the graphics card make me think that it is the power of the mac that does not hold the charge, but it does not make sense, since I have a second power supply for the card. How do I know if it is the power supply of the mac that disconnects? In which case, I replace it, that is not too hard. In view of my current needs, Apple does not offer me any machine answering. What would be the best solution for me: - Keep the macpro as long as possible, by putting a used GTX 980 (or a 1080 by going under Boot Camp). Hoping that I did not damage the internal power supply of the mac, I would no longer need the auxiliary power supply, and everything should return in order. But if the apple offer does not improve, I should migrate one day or the other on a PC - buy a PC directly I also thought about the hackintosh, but it will be like prolonging my Mac Pro, I should sometime pass on windows, because I doubt that Nvidia offers the drivers for the 1080 and its future cards. Thank you in advance for your help.