Hi, I have a mac pro 3.1 with 8gb ram, GT8800, SSD intel 330 120GB and a HD 7200rpm 500GB. My job is architecture, and i usei it almost to autodesk architecture 2013 and autodesk 3d viz 2013 on windows 7 and adobe CS5 and aperture on mac OS ML. I want to upgrade this machine to get a faster rendering time for my job. My first tough, was to upgrade the graphic card. If I'm correct, after read some threads here, I want some faster, that I can see the bootable gray screen (holding option) and don't need to change anything about power cables and etc... What is my options? Regards all!