Post originale di: teofranceschini ,
My MBpro Oct-2014 has an SSD and I noticed the same issue, especially when a computation starts on matlab or when I start a movie... but it does it also when still and idle (less often). The sound is exactly the click that you hear due to the “hard disk initializing “ (classic sound I heard on my old laptop when turning on, a couple of clicks before the speed goes up) but obviously it can’t be that: apart from the fan, everything here is solid state without moving parts. I have two guesses: thermal expansion due to the processor instantaneously warming up (and my sensor having some delay? I monitored it without noticing anything strange) or wrong pwm signal to the fan, that glitches sometimes and stops it in micro-periods. The second hypothesis looks more real, but I don’t know why I started noticing it since Sierra.