https://blog.wongcw.com/2018/11/24/7nm%ef%bc%8bzen2%ef%bc%81amd-64%e6%a0%b8%e5%bf%83%e4%ba%8c%e4%bb%a3epyc%e9%9c%84%e9%be%8d%e5%b7%a5%e7%a8%8b%e6%a8%a3%e5%93%81%e9%a6%96%e6%9b%9d/