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Unfortunately, Realtek is the one and only choice for a USB 3.1 to 2.5Gbit Ethernet controller. We don't like it any more than you do, but there are several niches in the PC peripheral space where there is no alternative to using a Realtek part.

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What about a Thunderbolt connection and a PCIe ethernet adapter - could that work?

The power consumption of this would be too high.

And the cost, probably. 40$ for 2.5Gbit is not that bad of an offering; at 80$, this would probably be even more niche.

How about Aquantia?

As far as we can tell, Marvell end of lifed the USB to Ethernet solutions. If anyone from Marvell can tell us otherwise, we'd like to know!

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