Thread: M1 Mac Thunderbolt 4 ports don’t support USB 3.1 Gen 2
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chucker
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Join Date: May 2004
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2022-04-19, 08:45
Quote:
Originally Posted by PB PM View Post
They did the test with thunderbolt cables, seems odd. Why didn’t they try to see if using a USB 3.2 Gen2 rated cable would solve the problem?
My read is they tried both, and also that it wasn't a problem on Intel.

Quote:
Cables used included a certified Thunderbolt 4 model, and the USB-C (data) cables provided with the cases. Again, each was verified by establishing SuperSpeed+ 10 Gb/s connections to an Intel Mac.

[..]

When connected to an Intel Mac using a USB-C cable, connection speed was given as 10 Gb/s, with typical read rates of 470 MB/s, and write rates of 480 MB/s.

In all five connections made directly to a Thunderbolt port on an M1 Mac, using either a USB-C or Thunderbolt 4 cable, connection speed was 5 Gb/s. Read rates ranged between 386-406 MB/s, and write rates between 430-435 MB/s.
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