I would like to go to two 4k monitors at retina resolution at my Mac Pro 6,1 workstation. It would be cool to also be able to use them with my 15" tb mbp and my wife's 13" tb mbp so the LG 4K UltraFine (with the current price break) is my first choice. Any thoughts on how to go from TB2 on the Mac Pro to the USB-C input on the LG? And ( I am not sure the Mac Pro has the hardware to support it) is there a way to hook up 2 5K UltraFine monitors to a Mac Pro 6,1? (1 or 2 TB2's to TB3)?