guys hi sorry if there are same answers already here. I have mac pro 2010 (5.1, single xeon proc 3.33). I am thiinking to buy a GPU to it, to change hd5770. It can be: 1. Titan x pascal 2. rx580/rx590 3. vega 56 or 64 or your choice -what is best? I have bootcamp to win 7 on it and yosemity macos for right now. Any suggestions to choose the GPU. thx in advance. DO not want to do any modding to PSU etc.