title: Confused about difference between Intel Optane's Memory Drive Technology (IMDT) and DCPMM memory mode
body: <p>I am confused about difference between IMDT and Intel DCPMM's memory mode.
  I understood that both technology use DRAM as an extra L4 Cache, and Intel DCPMM's memory mode makes DRAM non-addressable (which means system memory is only shown as sum of DCPMMs' capacity). I referred link below.</p>
  
  <p><a href="https://venturebeat.com/2019/12/09/optane-essentials-part-2-memory-modes-and-optimal-workloads/" rel="nofollow noreferrer">https://venturebeat.com/2019/12/09/optane-essentials-part-2-memory-modes-and-optimal-workloads/</a></p>
  
  <p>So my question is, does IMDT also make system DRAM non-addressable? Moreover, when I use IMDT, does system DRAM shown as system memory count? </p>
  
  <p>Thanks.</p>