USB 3.2 Gen 2x2 on Thunderbolt 3/USB4 (iMac 27" 2020)

Is anyone aware of any Thunderbolt 3 to USB 3.2 2x2 dock/adaptor type options to get around the limitation of USB 3.1 Gen 2 on the ports when connecting USB devicves? I've done some searching but not found anything yet.

Asking because I have the same issue here with SanDisk Extreme Pro NVMe Portable SSD drives. Maxing out just under 1GB/s when they're capable of double that.

Whilst it's still twice as fast as older style SSDs on a SATA6 USB adaptor, it's still annoying considering the cost difference between the two types of drive.

If anyone is wondering why you'd need such speed: multi-camera video editing with multi track audio and real time effects processing on top. I could obviously use the internal drive which runs at 2.5GB/s read and write, but it's very handy to have projects on external media for many reasons.

It's a shame SanDisk and others implementing these devices didn't include Thunderbolt 3 connectivity or have an option to purchase a Thunderbolt 3 variant.

If you want max speeds you need to connect directly to TB port on the Mac and use no adapters. USB 3.2 will not go over the 1000 GB/s. I use Trebleet TB3 enclosure for NVME and I run 2500 GB/s read/write

Indeed. I found a couple of Thunderbolt 3 NVMe drive enclosures that seemed promising; had to pass on them in the end though because we also have a 2012 Retina MacBook Pro which would need access and it only has Thunderbolt 2. I have the Apple adaptor for this (3 to 2 and vice versa), but unless the enclosure has it's own power (which these didn't), then it won't work on the older machine.

Fortunately, I'm able to send the SanDisk drives back for a full refund. If I can't get the full benefit at the moment, I may as well stick with the SATA3 (6Gbps) setup I've been using successfully for a couple of years now and save over 50% of the cost. It would have been nice, but it's not essential at this point.

About USB speeds: https://support.apple.com/en-us/HT201163

I don't think Macs support Gen 2x2, only Gen 2 (x1).

Also the 2020 iMac just has Thunderbolt 3. Only the M1 macs have USB 4.

I also see <1000 but if you use that same drive in a NVME TB3 enclosure it will run close to WD advertised spec. I have done this on my iMac many times switching enclosures.