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Hans Brinker Author

Level 1

13 points

USB 3.2 Gen 2x2 on Thunderbolt 4

I have a MacBook Pro M1 model 2021 with three Thunderbolt 4 slots.

I am considering to buy a SanDisk SDSSDE81-2T00-G25 Extreme PRO portable NVMe SSD.

On the Internet I read the following warning:

This drive is capable of 2000mb/s, but your computer must support dual-lane USB 3.2 Gen 2X2, essentially using both lanes of USB-C connectors to deliver speeds up to 20Gbps (or 2.5GB/s). As of this date, no Mac products support the new USB 3.2 Gen 2x2 standard. They only support USB 3.2 gen 2, which is one lane at 10Gbps (or 1.25GB/s). So if you have an Apple/Mac machine, this will not work at its fullest speed.

My question: is the latest model with Thunderbolt 4 compatible with the new USB 3.2 Gen 2x2 standard?

I cannot find any information about this.

MacBook Pro (2020 and later)

Posted on Nov 17, 2021 2:26 PM

Top-ranking reply

Sonicray

Level 5

4,556 points

Posted on Nov 18, 2021 1:02 AM

Hi Hans,

Yes, support for the 2x2 standard is optional for OEMs. In this case the M1does not support it. I have a brand new MBP 16 inch M1 Max. The ports on the M1 are either Thunderbolt 4 / USB 4 @ 40Gbps or USB 3.2 gen2 @ 10Gbps… no in between

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USB 3.2 Gen 2x2 on Thunderbolt 4

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