I have an 8 core Mac Pro. Looking to upgrade from the 5770. I did try to do some of my own research, but I'm still not sure about the best option. I have two apple ACDs with mini-display ports. I'm not sure not what converter to use in case a GPU I chose does not have two mini-display ports. I want the best card I can buy with a budget of $700. I was looking into the 7950 but isn't plausible AMD will release the 280 or 290 for the Mac in the near future? That is what is holding me off. Say I get a 780 Ti, will it work without an external PSU? I am not interested in an external PSU. It can pull 250 watts and I believe the Mac Pro recommends 220w or lower. Should I go with a 7950 or hold off for a mac version of the 280 or 290?