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Intel X550T2 only 100 Mbit/s

sugram
Beginner
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hello

 

I have build a new PC and installed an Intel X550-T2 network card.

I have a 10 Gbit switch in my network and also a NAS that is equipped with 10 Gbit. I have now installed W11 and the latest Intel drivers.
It also shows that the card has negotiated 10 Gbit. But the file transfer is only around 90 MB/s.
I have another PC that is also in the 10 Gbit network and I can easily reach well over 120 MB/s there.
When I start a rescue medium from the Macrium backup software on my new PC, I reach 3.8 Gbit/s.
So it must be a setting or something similar. But I don't know what else I should do here. I have already set the speed to 10 Gbit, but it had no effect.
does anyone here have any other ideas

Regards

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sugram
Beginner
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I have now installed Windows 10 for testing and the same LAN drivers. And here it works perfectly. I get around 550 MB/s.
So it's Windows 11. Does anyone have an explanation or solution for this?

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