Here’s some recent test data for linear power supplies. Looks like no audible difference. I was considering buying a Small Green Computer, but when I talked to the company they tried to sell me power supply magic that cost more than the server. When I questioned the need for the power supply equipment, they reported Mac mini ports are noisy. There is also little negative date about noisy usb and many professionals are using 2018 Mac mini’s for audio mixing. I’m going to save my money and stick with my Mac Mini.
https://www.audiosciencereview.com/forum/index.php?threads/do-you-need-linear-power-supply-for-dacs....
https://www.audiosciencereview.com/forum/index.php?threads/do-you-need-linear-power-supply-for-dacs....