Fucking horrible, worse that I expected and more audible than GOW even. I mean, I get that being summer it makes it worse, but even then my gf shouldn't be able to hear my game console when she wants to sleep in the next room. Also, not only noise, but heat also. I have it under the TV on a cabinet with no doors, laying flat alone with 15cm free of space all around it. Under the PS4 Pro, I save some controllers and a Mac Mini. Every time I stop playing (like 1.30-2 hour sessions), if I touch the Mac mini, which is umplugged and separated from my PS4 by a 3cm wood and 25cm of air space on top of it, that thing is HOT.
The PS4 Pro cooling system is the most annoying thing this whole generation and basically a big big fail in design. I hope they step up the game big time with the PS5 because this is unnaceptable.