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

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21 replies

Hans Brinker Author

Level 1

13 points

Nov 18, 2021 12:48 AM in response to Sonicray

Thank you for your quick reply.

However I am not sure that you are speaking of the Thunderbolt 4 of the 2021 models.

Does it make any difference?

Hans Brinker Author

Level 1

13 points

Nov 18, 2021 1:49 AM in response to Sonicray

Thank you for your reply. It made it clear although the USB jungle is still very confusing.

Now I know not to order this drive and opt for the slower version.

Feb 1, 2022 4:41 PM in response to Kuttoh

Can you give an example of a suitable enclosure and ssd?

Mar 30, 2022 3:42 PM in response to Sonicray

If you use a Thunderbolt 4 cable with a USB 3.2 Gen 2x2 SSD Drive that is capable of 2000MB/s, will you then get those faster speeds on the M1 Mac?

Apr 28, 2022 6:53 AM in response to Kuttoh

Theretically yes it is supposed to work but look here he is using an SSD with thunderbolt port: https://youtu.be/KsiYDs7dNy0

It did not perform well.

thanks

Apr 29, 2022 12:13 AM in response to TonyJohnVan

I also learnt that Apple fixed this issue with Thunderbolt 4 in their iOS 15 update. Is this true. Was your test done after this update?

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USB 3.2 Gen 2x2 on Thunderbolt 4