I have few questions about Late 2013 Mac Pro....and its GPU connections: - I have two Thunderbolt Displays connected to it, and in whichever Thunderbolt port I connect them (1 through 6), in System Information it says that both monitors are connected to AMD Fire Pro D300 (Slot-2). Is this normal ? There is never display connected to Fire Pro in Slot-1. - Is there any logic in OS X display numbering ? For example monitor connected to Thunderbolt Bus 1, Port 1 is Thunderbolt Display (2), and other one to Thunderbolt Bus 2, Port 2 is Thunderbolt Display (1)... which to me does not make no sense.