Technically AMD's APUs (the Ryzen 2400G and other CPUs with integrated GPU of the Vega generation) do support it, but for some reason AMD has never enabled this

Technically AMD's APUs (the Ryzen 2400G and other CPUs with integrated GPU of the Vega generation) do support it, but for some reason AMD has never enabled this in their discrete cards. Neither have they released a low end Vega discrete card either. They have the tech, but don't seem to be interested much in the low end.