https://blog.wongcw.com/2019/06/06/%e8%8a%9d%e5%a5%87%e5%89%b5%e9%80%a0ddr4-5886%e9%a0%bb%e7%8e%87%e6%96%b0%e9%ab%98%ef%bc%9a%e9%80%a3%e7%a0%b423%e9%a0%85%e4%b8%96%e7%95%8c%e7%b4%80%e9%8c%84/