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Unstable Thunderbolt 3 USB transfer speed on NUC8i7HVK

Voodoo
Beginner
180 Views

Recently I found that the transfer speed of Thunderbolt 3 ports on the back of my NUC8i7HVK (Hades Canyon) was unstable.

 

Usually only one of those two Thunderbolt 3 ports was used to connect a eGPU box, and it seemed to be no issue at all.

 

Few days ago, I connected a portable SSD with USB 3.1 Gen 2 Type-C port (a 2TB PCI-E 3.0 NVMe M.2 SSD inside an ASUS ROG SSD enclosure) to the one of those Thunderbolt 3 ports, and I found that the transfer speed was unstable.

 

Theoretically the constant transfer speed should be always around 1000MB/s when copying a big file from the inside NVMe SSD to the portable USB 3.1 Gen 2 SSD, but it was not. 

 

Not only the peak transfer speed was only around 250MB/s, but the transfer speed was very unstable, it could only reach 250MB/s for about one or two seconds, then it dropped to zero according to the Windows Task Manager, and then back to 250MB/s again.

 

Another strange thing was that when the transfer speed dropped to zero, the disk active time reached at 100%.

 

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I checked all the software and driver settings, including trying to disable or enable the cache option in Windows Device Manager, the issue always exist.

 

I also tried to connect another external USB hard drive to Thunderbolt 3 ports, the result was the same.

 

When the portable SSD was connect to the Type-C port on the front panel, everything was fine, the transfer speed could be kept at 900MB/s.

 

BTW, the driver and firmware of the Thunderbolt 3 controller were updated to the latest version.

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1 Reply
JosueO_Intel
Moderator
148 Views

Hello Voodoo,


Thank you for posting on the Intel communities. 


We understand you have opened a web ticket with us and we will continue to help you through that channel now. We will therefore close this community case. Thank you.


Regards,

 

Josue O.  

Intel Customer Support Technician



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