Stephen Hackett bought a 5K iMac last month. But I am apparently the devil on his shoulder, so he returned it and bought an iMac Pro instead:
It didn’t take long to realize that I had made a mistake. Even during the migration, I could hear the new iMac’s fan blowing, and once I was logged in, it was even louder… the Core i7-powered iMac on my desk seemed to ramp up its fan far more often than my older i5, and when it did, the noise was noticeably louder than before….
Even under load, this iMac Pro is silent. The fans seem to spin all the time, but Apple has the machine tuned in such a way that they don’t really ever speed up; the exhaust air just gets a little warmer. With my microphone less than a foot away, I don’t have any fan noise in my recordings. That’s a big win for me.
It is striking to use a computer that, when under extremely heavy loads, doesn’t rev up its fans like a jet engine.
—Linked by Jason Snell