https://blog.wongcw.com/2018/11/01/amd-zen2%e6%9e%b6%e6%9e%84%e6%96%b0%e5%a2%9e%e5%a4%9a%e6%9d%a1%e6%8c%87%e4%bb%a4%ef%bc%8c7nm-epyc%e5%a4%84%e7%90%86%e5%99%a8%e9%a6%96%e5%8f%91/