You can't do it on a Mac (unless you want to run two non-supported graphics cards sharing 4 lanes on a Thunderbold/USB-C connector instead of each having their own x16 PCIe connection)
Re:Rust/WinRT Public Preview
by noisem4ker on Thursday April 30, 2020 @05:56PM
(#23036653)
To their credit, stability of such a setup might be facilitated by Windows' fine display driver model (WDDM).
Not exactly thanks to Microsoft.