I've been testing a lot to see how the two rendering systems compare. Weird thing is after selecting one to change too, exiting Vegas, restarting, then running the new media manager to see GPU performance I see both GPU showing activity (5 to 10% for AMD and upto 60% for intel HD 630) during render. This does not seem to impact render time (actually hurts it). Then sometimes it displays only one. This is using the Magix ACC/AVC and Sony Xavc codecs.