Hi  @Mattia72,

Could you take a screenshot with error message? Which may help us locate the issue faster.

Please check can the Adapter be detected?

Step 1: Go to Computer Management>Device Manager>Action>Scan for hardware changes, and check if it shows up in Network Adapters/Other Devices/Universal Serial Bus controllers.

Step 2: Plug the adapter into another USB port/PCI slot and do step 1 again, or install the adapter on another computer to see if it can be detected.
(Note: You need to shut down the computer before changing another PCI-E port)

Step 3: Right-click on My Computer>Properties>Hardware>Device Manager and double-click on "Universal Serial Bus Controller" to go to several "USB Root Hubs" and double-click on any one to open the Properties dialog and switch to the "Power Management" tab. Remove the checkbox before "Allow the computer to turn off this device to save power". Click OK to return, and restart the computer.

  @Joseph-TP Hi thank you.

I uninstalled and reinstalled the card with driver 3.1.6.0 (but the card doesn't work with driver 3.1.10.0 too) and as you suggested I disabled energy saving. I can't try the card on another PC or on another slot (the only one with 16 pin x4, the other with 16 pin x16 has the graphics card).
The card worked correctly for a few minutes even if at a maximum download speed of 4.2 GBps, but then it stopped working again. Below are the screenshots:

Can you give me directions on how to reactivate the card and how to improve the data transmission speed? Thank you very much

Hi @Mattia72,

The tech team was made aware of your issue, they will likely reach out to you via email to continue to troubleshoot your issue. Please check your email box and confirm.