Lacie external SSD fast, SanDisk Extreme Pro V2 SSD slow. Any ideas?

[nconnella]

Anyone having issues with SanDisk Extreme Pro 4TB v2 drives getting fast speeds? I've read people having trouble clocking faster speeds on older M1 Macs but how about the new MBP's?

My 2TB Lacie SSD 2800mb/s is getting at least 1600mb/s.

Using the same port and thunderbolt 3 cable, the SanDisk Extreme Pro is only getting about 900mb/s. I have a message out to Sandisk tech but figured I'd check here if anyone is having trouble with this particular drive.

Both drives are formatted APFS.

 

[KDLM]

Anyone having issues with SanDisk Extreme Pro 4TB v2 drives getting fast speeds? I've read people having trouble clocking faster speeds on older M1 Macs but how about the new MBP's?

My 2TB Lacie SSD 2800mb/s is getting at least 1600mb/s.

Using the same port and thunderbolt 3 cable, the SanDisk Extreme Pro is only getting about 900mb/s. I have a message out to Sandisk tech but figured I'd check here if anyone is having trouble with this particular drive.

Both drives are formatted APFS.

There is another thread here and a review on Amazon that report that to get the 2000 MB/s (guess that is Mb/s, but it is listed as 2000 MB/s on the item description on Amazon) you need a computer that supports 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). AFAIK, no Mac supports that. I can confirm the new M1 Max 16" MBP does not.