A couple of years before a friend gave me an old first gen ps4 because it was making excessive noise and he bought the ps4 pro. The only thing that interested me on ps4 was gran turismo 7. But unfortunately it was unplayable because of the noise, the ps4 started to make like a jet fighter engine taking off as soon as I reached the game's central menu. The game was running but at 70db noise. I decided to open it and change thermal paste so I did, thorough cleaning and new thermal paste. But the problem persisted same levels of noise...I left it sitting without using it of course I didn't want to lose my hearing but it was always bugging me what was the reason for the noise...I remembered that when I opened it I saw that the thermal pads didn't look in good shape and think that ps4 was on since day one for many years and was used by him and his 3 chidren, a total burnout. So I scheduled another operation ordered some new 1mm thermal pads, changed them and here you go. NO MORE NOISE!!! Now the console is quiet like new and doesnt reach above 45 db that is a huge difference, you can have it near you and it doesn't bother even if you have the game in low sound levels.
Guys I hope that helps because I searched the whole internet for a solution to the noise problem but didn't find anything so I present you the real solution!