Quartus & mulithreading? what will the future bring? X9 or Xeon, what to choose?

Maximum processor that Quartus can support is 16 cores https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/qts/archives/qts-qpp-5v1-17-0.pdf, 6.3.3 and the recommended RAM size can be found in here http://fpgasoftware.intel.com/requirements/18.1/. I could not tell explicitly how much compilation time difference between PCs that have different cores.