A new TB3 to PCIe PCB appears: Not cost effective, but this is interesting.
I spotted many listings for this thing on ebay. It is definitely too expensive (even Bizon's Thunder3 PCB sale is cheaper nowdays), but the fact that it even exists is somewhat noteworthy, as typically that kind of product does not exist due to Intel licensing constraints. I am willing to bet it would work as an eGPU adapter if a powered riser is used to feed power to the card. It would be interesting to see if it drops in price in the future.
My eGPU Zoo - Link to my Implementations.
Want to output [email protected] out of an old system on the cheap? Read here.
Give your Node Pro a second Thunderbolt3 controller for reliable peripherals by re-using a TB3 dock (~50$).
"Always listen to experts. They'll tell you what can't be done, and why. Then do it."- Robert A. Heinlein, "Time Enough for Love."
One would think, given how minimal this product is, that its price would already be lower than any other TB3 solution available. It doesn't even come with a PSU or case.
Perhaps there is another reason why it costs so much? Perhaps limited quantity due to the licensing constraints you speak of?
The second paragraph is all idle speculation of course. I'm talking out my butt.
ThinkPad X230t, i7-3520M @ 2.9 GHz, Windows 7
EVGA GTX 1070 Hybrid, 2113 MHz @ 1043 mV
x1.2Opt, PE4C V3.0, 4Gbps-EC2