PS4 loud as a plane only when playing a game

So my ps4 is loud ONLY when any game kicks in, in the dashboard its pretty quiet but at the start and load of any game (On disc or downloaded from the store) it kicks in and makes the noise of the start up of some Boeing 777. My cleaning process was simple, took off some dust from the whole system, cleaned the fan with compressed air and the heat sink the most “vitals” to fix this.I heard that changing the thermal paste might be worth a shot but some people doubt this. I really dont know what to do with this, the ps4 model is CUH-1215A

If this matters i haven’t used my ps4 in like 5-6 months