Unfortunately, most Mac ports of games have lower performance (sometimes up to 50%) and less features than their Windows counterparts. Even A+ ports like CS:GO

Unfortunately, most Mac ports of games have lower performance (sometimes up to 50%) and less features than their Windows counterparts. Even A+ ports like CS:GO look different (some shaders disabled?) and don't feel nearly as good to play. I doubt these Metal eGPUs will be cross-platform. Unless you're using them for professional work, I think it will be better to just get something like the Akitio Node and use it in BootCamp.