I feel like I did enough testing to characterize it (
#466). Handbrake x264 encoding is no Prime95, but it does completely peg the CPU at 100% continuously. This plateaus the temperature at 90C and the power draw at 16W, but the fans only get to to barely audible at that point (ear right on keyboard)
GPU stress along with high CPU can push it into the 25W range, but the fan is still only just audible, not loud at all.
Temps never get to 100C like on my 15" 2015 MBP and so there's never any throttling.