Can someone explain whether I should care that they are still using DP 1.2 rather than 1.3? I had thought 1.3 was needed for non stitched 4k 60hz, but this should have plenty of bandwidth, so I'm now not sure what the issue with 1.2 vs 1.3 is.
Displayport daisy-chaining for screens above 1980x1080p requires 1.3. (Using two daisy-chained dell screen's on my 2011 macbook air does not work because it requires 1.3 and mba only supports 1.2.
It appears that this cable has 8 lanes of DP 1.2 connectivity. 4 DP 1.2 lanes is enough for a non-tiled 4K 60hz display. So TB3 can supply enough bandwidth for two of them. A 5K 60Hz display requires either DP1.3's higher bandwidth lanes or more than 4 DP1.2 lanes teamed in a tiled arrangement. TB3 with DP1.2 will be able to handle single tile 4K displays or double tiled 5K. It will not be able to handle single tile 5K or the other features of DP1.3 (high refresh rate/8K/alternate bit depths)
The article claims dual 4k @ 60Hz over 1 cable; so that seems to rule out stitching? That, or it's an awful lot of DP1.2 channels + stitching, which I didn't know worked with multiple physical heads.
