Sometimes I see a frozen render. Maybe it only work on Intel CPUs...

Nope. Appears to be broken for Nvidia 10 series. I'm on Intel with a 1070ti + another user reports issues on the 1080ti (see similar post in this thread; reported to author here: https://github.com/chrxh/alien/issues/21).

Just informing that this really worked on an old i7 920 with 24 GB and a RTX 2060 Super (8GB). I didn't even need to install the CUDA SDK on this one.

Since the i7 920 supports less instructions than the 3700x, it really is a specific problem with the GTX 1070 (8GB)

Thank you for letting me know!

Later I'm going to test it on another computer with a RTX 2060 super, but slower CPU and slower interconnections (PCIe).

Thanks for the link too. :)

Aha... well that explains why my 1060-based system didn't work.