I've been test driving an LG 34 inch 3440x1440 this past week. It's plug and play with the Mac Pro cylinder. It comes with 2x Thunderbolt, 1x DisplayPort, and 1x HDMI ports. I also connected it to the Mac Pro tower with GTX 980 Ti using the DisplayPort. With the Apple Thunderbolt display reaching end of life, it's nice to know there are good alternatives for legacy Mac Pros. Even if a new Apple Thunderbolt display is announced, it will likely have USB-C (Thunderbolt 3) ports -- necessary especially if it is 5K.