https://blog.wongcw.com/2022/01/19/%e4%b8%89%e6%98%9f%e9%9b%bb%e5%ad%90%e6%ad%a3%e5%8a%a0%e9%80%9f3d-dram%e7%9a%84%e7%a0%94%e7%99%bc/