The 2019 Mac Pro can have different Thunderbolt port and controllers (or BUS) numbers.

But for best results, you should not connect anything else on the other port as because there is only one controller, the bandwidth is shared between the 2 ports. You can plug in your video device to any of the 2 Thunderbolt port. The 2020 intel iMac 27' come with 2 x Thunderbolt 3 ports, and only 1 controller (or BUS).

You can plug in your video device to any of the Thunderbolt Controller/BUS, as each connector has its own BUS, there should be no impact on performances if you connect something else on the other port. Recommended configuration for best performances

6 Thunderbolt ports and BUS for the Mac Studio M1 Ultra.

4 Thunderbolt ports and BUS for the Mac Studio M1 Max.

3 Thunderbolt ports and BUS for the MacBook Pros M1 Pro & Max.2 Thunderbolt ports and BUS for the M1: Mac mini, MacBook Air, MacBook Pro 12'.With Macs using the Apple Silicon M1 (Pro, Max, Ultra)Īll the M1 computers currently have the same number of Thunderbolt controllers as the number of ports (so they have one BUS per Thunderbolt port).ĭepending on which computer you use, you will have different numbers of thunderbolt ports:

Late 2017 mac mini video input