Steam Link uses Steam In-Home Streaming, which is a different technology than nVidia's GameStream. Steam Streaming will even use the CPU for video encoding/dec

Steam Link uses Steam In-Home Streaming, which is a different technology than nVidia's GameStream. Steam Streaming will even use the CPU for video encoding/decoding, so it isn't necessarily dependent on your GPU. Though, for best performance you will of course want hardware encoding. I do not know which GPU's Steam supports hardware encoding on. A quick Google and browse through Steam's FAQ on this topic indicates that they at least support nVidia GPUs and Intel GPUs for hardware encoding; no mention of AMD. But again, Steam will happily use your CPU to do the work if it has to.