https://blog.wongcw.com/2021/09/02/%e6%a9%9f%e6%a7%8b%e7%a8%b1ddr5%e8%a8%98%e6%86%b6%e9%ab%94%e6%a2%9d%e5%b0%87%e6%af%94ddr4%e8%b2%b430%ef%bc%9a%e7%ad%86%e8%a8%98%e6%9c%ac-diy%e6%99%ae%e5%8f%8a%e8%a6%81%e7%ad%89%e5%85%a9%e5%b9%b4/