If possible...test with other devices... USB sticks... etc.
I assume you're testing with a program like CrystalDiskMark ?
You can't go by Window's transfer gauges or even reported transfer speeds.
For example.. the free Macrium Reflect v7, reported 23 GB/s when making a full OS image backup. It took 2:30 minutes to complete.
Now I'm on the paid v8 and it reports 11.2 GB/s, yet the backup still takes 2:30 minutes.
Even in internal file transfers, I notice wildly different speeds.
I think that with the latest BIOS and chipset driver, you have to assume Windows is letting USB 3.2 work at top speed.
Use CrystalDiskMark to test your device.
Get the .zip (portable version) here:
Download – Crystal Dew World
...make sure you get: CrystalDiskMark 8.0.4, and not CrystalDiskInfo.
A few months ago I bought a 256GB USB stick that supposedly had read/write speeds about 440MB/s
So I tested it with CrystalDiskMark, while plugged into a 3.2 port...
The top pic is the default settings. I changed the file size for the bottom pic.
CORSAIR Voyager GTX 256GB USB 3.1 Premium Flash Drive - Newegg.com
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EdTittel