Good Morning! I write because I have long been reading your forum but I'm very very lost with the updates I want to make my MAC PRO 5.1. - I bought a Intel Xeon w3690 3,46ghz and I'm waiting for it to arrive. So I update my old Quad-Core 2.8. - I need your help to decide which GPU to install. I need to change my old 5770 because it does not work well. I do not want to have problems with the original power supply (not want to have an external power supply) or with the drivers with any operating system. I had been thinking about the Nvidia Geforce GTX 680, do you think? I do not want to waste money. Now I use OSX 10.9.5 but i would like to upgrade SO. Use the mac to work, full package Adobe CC and web design. - I have 16gb 1066mhz DDR3 ram. - I want to also install hard disk solid as main unit to gain a lot of speed but I do not know how to clone the old hard drive. I can't lose any information (SO, Folders, Pictures, Music...) - I also want to change the display by a Dell p2715q. Please help, because when I read old posts I get lost and do not understand anything ;-( Thank you very much!