https://blog.wongcw.com/2019/06/08/%e4%b8%89%e6%98%9f%e5%96%ae%e9%9d%a232gb-ddr4%e5%85%a7%e5%ad%98%e6%a2%9d%e9%96%8b%e8%b3%a3%e5%94%ae%e5%83%b9%e7%b4%841077%e5%85%83/