Mac mini, iMac Pro, and Macbook Pro all have two Thunderbolt 3 controllers. The Mac Pro starts with two controllers but can be configured up to six. The I/O i

Mac mini, iMac Pro, and Macbook Pro all have two Thunderbolt 3 controllers. The Mac Pro starts with two controllers but can be configured up to six. The I/O is actually pretty good and provides for a ton of headroom for expansion down the line (I'm thinking primarily storage and GPU for my use-case). I can see a pretty high powered eGPU saturating the lanes.