I would call the iMac Pro I have, dead silent. It’s a few years old, from right when the iMac Pro first came out but it’s holding up well. The fans ran at first when I was installing everything and my Dropbox sync folder were syncing but in daily work, the fan NEVER kicks on. Even if I’m doing a 192k analog play/capture session in REAPER. No fan noise. It is kind of far away from me…6 or 7 feet and down low but even when it was closer, or I get closer, it’s just dead silent.
Before I got the iMac Pro I remember trying one of the first retina IMacs and that fan was too loud, and too easily triggered so I returned it and waited for what ultimately became the iMac Pro.
What isn’t silent is the Sonnet Thunderbolt Expansion Chassis I need to use my RME and UAD card with the iMac Pro, but I read on a forum that since audio cards tend to run cooler than video cards, it’s safe to disconnect the fan in the Sonnet, so I did. No problems at all after a number of years and disconnecting the fan makes it totally silent.
The Mac Mini fan does kick on easily but I found an app that can turn Turbo Boost off when certain apps are running and with that handy little app, the fan never kicks on, so it’s silent too when I’m working.
The new Mac Pro is a little overkill maybe, but I look forward to having everything in one unit again like the old days, and since my Mini at home is kind of borderline too weak, and my iMac Pro is going on a few years old, I think I’m ready to upgrade the main rig and move the iMac Pro home.
I don’t really fear new computer change too much, and I’ll be forced to use Catalina on the Mac Pro when it arrives, but I do foresee the new ARM Macs being an issue for a time until all the software developers and hardware manufacturers figure it out, so I think I’ll do one more Intal Mac before going down the ARM path after the dust settles.