https://blog.wongcw.com/2018/12/16/amd-7nm-epyc%e6%8b%bf%e4%b8%8b%e7%ac%ac%e4%b8%89%e5%a5%97%e8%b6%85%e7%b4%9a%e8%a8%88%e7%ae%97%e6%a9%9f%ef%bc%9a20%e8%90%ac%e6%a0%b8%e5%bf%83/