Voted Best Answer
May 29, 2019 - 01:46 AM
If you are using 2016/19 licensing you MUST run the 2 Proc and 8 Cores per Proc min - regardless of what you are actually installing (e.g. 2012). And you always license all the hardware procs/cores.
2012 and 2012 R2 carried the same 2 processor minimum and also allowed 2 VMs per instance (so 2016/9 is just copying 2012 but with core added).
2008 was Per Server at Standard, which allowed it to be either installed as 1 physical or 1 virtual (and don't forget 2008 has no support at all from Jan 2020 so it should be on its way out!)