Gregory's Server@marcan What is "using Thunderbolt" here, practically speaking? Using Thunderbolt bandwidth/DMA for a DisplayLink-esque device? Since any external GPU is out of the question because of IOMMU limitations (if I understand correctly), I'm not sure how Thunderbolt fits into the picture for single-port-multi-display functionality...
...unless you mean like a Thunderbolt dock mirroring the single video stream across all of its outputs... but a basic MST hub will do that on its own anyway. Am I missing something?
@Skirmisher Thunderbolt tunnels DisplayPort, and these machines support two such tunnels per port. That's different from DisplayPort MST, which is not supported.