Wrong premise: Thinking that settings shown in some other demo somewhere else is same as there. What's real: You can create simple preset which will choke 8C/16T which will run well on 12C/24T. And that's what AMD did. That's unfair part because you really can have reasonably good streaming on 8C/16T. AMD simply made scenario where one fares much worse. No reason to think that AMD had different settings under the hood for each of tested processors.