Phoronix has done a performance comparison of the AMD Threadripper 2990WX in Windows 10 Pro and Linux and the results show Threadripper numbers significantly lower under Windows 10 Pro than in Linux. In some tests such as 7-Zip Compression, the Threadripper 2990WX posted almost 58% higher scores in Linux compared to Windows 10 Pro implying that Linux is a better OS of choice when testing high core count CPUs.
https://www.notebookcheck.net/The-AMD-Threadripper-2990WX-shows-even-higher-numbers-when-benchmarked-on-Linux.323072.0.html