Can someone explain how monitor connections work ? Background: my 2009 mac pro has 3x gt120 cards, and I have six displays running off of it. Easy. With this system, I see that there are six thunderbolt ports, so ... I could attach six displays there, right ? BUT, every mention of the graphics cards says "up to three 4k displays" ... What does that mean ? Does that mean that a 4k display requires two TB connections ? And if that is the case, doesn't that mean if I attach three primary displays at 4k, all I have left is the HDMI port, and then that's it - only four displays ? Thanks. EDIT: OH, and also, if 4k displays take up 2x TB, and since three displays is a very common setup, then you don't have any more TB ports, right ? So you have to choose between triple monitors or fast disk connection ?