https://blog.wongcw.com/2021/11/03/%e8%8a%9d%e5%a5%87ddr5%e8%a8%98%e6%86%b6%e9%ab%94%e7%8e%87%e5%85%88%e7%aa%81%e7%a0%b47ghz%e6%99%82%e5%ba%8f%e4%be%9d%e7%84%b6%e5%8f%aa%e6%9c%89cl40/