Is the USB speed issue fixed with the M2 ?

[chrfr]

T5 is only rated at 5 Gbps, not 10. Doesn't matter what the system reports it as. The SSD inside is m. sata and not NVMe.

No, the T5 will run slightly faster on a 10Gbps connection than on a 5Gbps connection, even on an Intel Mac, and even if it doesn’t fully saturate the 10Gbps USB connection.
USB connection speed is a function of the drive‘s USB bridge, not the SSD itself.

 

[joevt]

No, the T5 will run slightly faster on a 10Gbps connection than on a 5Gbps connection, even on an Intel Mac, and even if it doesn’t fully saturate the 10Gbps USB connection.
USB connection speed is a function of the drive‘s USB bridge, not the SSD itself.

Right, Samsung product page says USB 3.1 gen 2 and 540 MB/s. 540 MB/s (4.32 Gbps) is faster than USB 3.0 (4 Gbps) and is typical of SATA SSD.

It should be noted that a 10 Gbps USB port can sometimes do 5 Gbps USB faster than a 5 Gbps USB port because the 5 Gbps USB port may be from a USB controller that is limited to PCIe gen 2 x1. Both PCIe gen 2 x1 and USB 3.0 can do data at 4 Gbps but PCIe overhead lowers the max USB data bandwidth (maybe because PCIe overhead is greater than USB overhead?).

 

[Digitalguy]

No, the T5 will run slightly faster on a 10Gbps connection than on a 5Gbps connection, even on an Intel Mac, and even if it doesn’t fully saturate the 10Gbps USB connection.
USB connection speed is a function of the drive‘s USB bridge, not the SSD itself.

Yes, the T5 is a gen 2 drive (10Gb/s) but is not PCIe like the T7, it's a SATA III drive, so the bottleneck is SATA, not USB. SATA III is faster (6Gb/s) than USB gen 1 (5Gb/s), so it will run at full speed only on a gen 2 or Thunderbolt port, while a gen one port will bottleneck it to 5GB/s, making it run somewhat slower.
Of course these are the theoritical speeds. The actual speed I have measured are a max sequential (with 8 queues and 1 thread) of around 565 MB/s on a gen 2 port and of around 450 MB/s on a gen 1 port.

 

[theorist9]

For reference, here's the performance of a SanDisk Extreme V2 (USB Gen 2) when plugged into the 5 Gb/s USB Gen 1 port on a 2019 i9 iMac (screenshotted two runs to give a sense of the typical inter-run variation) (could have run it 10x and reported the means and SD's, but that's too much work ) . Drive is unencrypted (encryption slows things down):