![]() What about only being able to connect two Thunderbolt devices to the M1 Macs? The results using AJA System Test show that the 2 Thunderbolt ports of the M1 Mac are indeed on separate Thunderbolt buses as I get over 3,500 MB/sec reading from my stripe volume. The total throughput of both ports together on a single bus is limited to 2,800 MB/sec. Since the two ports in a pair are connected to one bus, they share the Thunderbolt bandwidth. Each pair of Thunderbolt ports on my Intel Mac is connected to a single bus powered by a dedicated controller chip. My other concern is that both my Macs only really have two Thunderbolt buses. ![]() On Intel Macs, each pair of Thunderbolt ports is actually one bus Both of them have only one Thunderbolt connection, so they must either be connected to a dedicated Thunderbolt port on my Mac or be at the end of a chain of devices. My desire for more than two ports comes from using bus-powered devices like the OWC Envoy Pro EX and the OWC Thunderbolt 3 10G Ethernet Adapter. Both my 2019 16 inch MacBook Pro and my 2018 Mac mini have four Thunderbolt ports, and I can’t imagine using a Mac with only two. Having only two ports doesn’t seem like enough for professional use. I have read a lot of complaints about the new M1 based Macs only having two Thunderbolt ports.
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