The heat sink in the iMac Pro was where things really started to shift. It keeps the Xeons in those machines reasonably cool while being whisper quiet at idle/low load and reasonably quiet at load. They really kicked it up a notch with the Mac Pro, which remains nearly inaudible at all times, and now that’s carried forward into the Mac Studio.
Really nice work. I’d love to see this kind of innovation in more standardized PCs — the NH-D15 and front fans in my custom built tower do a good job on thermals but their acoustics leave something to be desired, despite Noctua coolers and fans being some of the quietest on the market.