All that performance in such a thin chassis comes at the cost of fan noise. MSI Cooler Boost mode is a fancy name for "Maximum Fan" mode for users who want to exploit the Core i9-10980HK and Quadro RTX 5000 Max-Q GPU to their maximum potential.
https://www.notebookcheck.net/Core-i9-powered-MSI-WS66-workstation-is-super-sleek-super-fast-and-super-loud.490920.0.html