Well, I do professional work on a Pi4 every single day, and it's sitting on my desk naked as the day it was born. No case, no heatsink.jerrm wrote: ↑Fri Sep 13, 2019 1:56 pmIMO, a Pi without a case is a hobbyist toy. For any real deployment the Pi is inside something - be that its own case or another product. Cooling will still be needed. A 5 degree reduction in base temps will only delay throttling for minute or two. Great for short bursty applications, not so good for anything with sustained usage.
You statement about a 5 degree reduction only delaying throttling is inaccurate. If it drops peak temp below the threshold, then no throttling will occur. A lower base temp means less power going into the system and therefore more chance the inbuilt heat dissipation can keep equilibrium at a lower overall temperature. ie there is a total amount of heat and therefore power the board can dissipate (various according to ambient and board temperature) - reduce the amount going in and you are going to have lower overall equilibrium.