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There is a limitation on the width of the bus though. I recall reading this when it first was announced and it is referenced in the linked article that you reference [1]: 40Gb/s of bandwidth – or about 5GB/s – provided by Thunderbolt 3 is tremendously lower than 15.75GB/s offered by a fully-fledged PCI Express 3.0 x16 slot.

[1] http://www.kitguru.net/components/graphic-cards/anton-shilov...

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Single GPU setups show no performance degradation at 2.0 x16 and some/slight degradation at 2.0 x8.,

5GB/s should do just fine.

https://www.techpowerup.com/reviews/NVIDIA/GTX_980_PCI-Expre...

Good to see

Yes, but the bandwidth is not really needed. PCI-E data compression is a thing. You only lose like 10% performance when comparing ExpressCard (4Gbit) to native PCI-E

Sources:

http://forum.techinferno.com/diy-e-gpu-projects/6578-impleme...

and specifically:

http://www.3dmark.com/3dm/4476434

10% is kind of a lot.

Given that the alternative is an 100% of an integrated GPU, I'd still take 90% of a dedicated desktop GPU at my laptop dock.

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