Hello, I've been following a lot of the advices and guides on this forum, and I have been able to upgrade my MacPro 5,1 with a new processor, two SSD hard drives, a Lycom controller, new 1333Mhz DDR3 memory... it really feels like a new computer ! But, I cannot decide on which graphic card should I choose. I've bought a Dell UP2715K display , so I've been trying to find which models would be compatible with 5K. If I'm not wrong, the most recommended graphic card is the gtx 680, but I've came to the conclusion that is not compatible with 5K. The nvidia cards that I think would work are the 970 and the 980; I've discarded the TITAN X since it is way too expensive. I would like to connect a 4k display as secondary screen, but I'm not sure about how much memory should they have or if it would improve performace because of the higher resolutions of both displays. I haven't been able to confirm if any ATI (or AMD) card would work at 5K. I do most of my work with Photoshop, Illustrator and Maya, so I guess that CUDA and OpenGL are the most important characteristics that I should have in mind. I would greatly appreciate any advice on which model would be the best one. Thank you !