https://blog.wongcw.com/2018/11/18/q3%e5%ad%a3%e5%ba%a6dram%e5%85%a7%e5%ad%98%e7%94%a2%e5%80%bc%e5%86%8d%e5%89%b5%e6%96%b0%e9%ab%98%ef%bc%9a%e9%a1%af%e5%ad%98%e9%99%8d%e4%ba%863-ddr4%e4%be%9d%e7%84%b6%e5%be%ae%e6%bc%b2/