Thunderbolt bandwidth: 40Gbps per port or shared?

woodmeister50 wrote:

I recall, but not positive, on desktop Intel Macs with Thunderbolt3 and Intel controllers, there were two busses that were split up between ports, i.e. one controller per two ports. across what ever Thunderbolt ports were available. I believe that was the case someone will correct me if I am wrong.

That is correct.

I'm also not sure how the Apple Silicon Macs handle their Thunderbolt ports.

A lot depends on what model and year MacMini you have.

Anything before 2020 uses Intel controllers and from 2020 onward, Apple Silicon chips are the controllers.

What goes on inside the M-series chips is Apple's little secret.

What I can say, on my M4 MacBook Air which has two Thunderbolt ports and System Information indicates that there are two Thunderbolt4 busses. I believe that the M5 Pro chips are indicated to have four Thunderbolt 5 busses. Now, whether these are truly independent or channels from a single controller remains to be seen.

I recall, but not positive, on desktop Intel Macs with Thunderbolt3 and Intel controllers, there were two busses that were split up between ports, i.e. one controller per two ports. across what ever Thunderbolt ports were available. I believe that was the case someone will correct me if I am wrong.