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Discussion in 'MacBook Pro' started by MrX8503, Jan 18, 2017.
Anyone get 20gb/s under Thunderbolt in system report? Shouldn't it say 40gb/s?
I suspect the 2 ports might be sharing 1 TB3 controller, hence the reduced bandwidth.
That's the case for two of the four ports on the 13" tbMBP, so could be the same for the nTB.
Edit: Getting 20 Gb/s on all my ports via system report on my 15" too, weird.
That's weird. Well if yours say 20Gb/s too, then I guess that's normal behavior.
You need to attach a Thunderbolt 3 device for it to show 40 Gb/s 1x.
That must be it then! Mystery solved I don't have any TB3 devices yet, only USB C stuff (LG 4k) so can't test it myself.
Here are two images showing what I see on my System. Note that all Thunderbolt ports show 40 Gb/s except the port that has the ThunderBay 4 which is a Thunderbolt 2 device.
Note: I disconnected the ThunderBay 4 so there were no devices plugged into the right side USB-C connectors and both Thunderbolt ports reported 40 Gb/s.