Had stock one and along with the case fans and everything it was actually about 60dB on IDLE, hitting like 85-92dB on full load, which was insanely loud! Now it's more like 50dB full load, just lovely!
I don't know how a stock AMD cooler looks like, but I have an AMD PC, and mine is quiet-ish, and not even temperature controlled.
Though to be fair, mine is an ancient AMD CPU, so I doubt it counts
Stock AMD coolers aren't bad, they do a great job and probably are the best air-coolers you can possibly find, it's just that certain generations of them and mainly the one I had with FX6350 was INCREDIBLY loud at full load, so I changed mostly for the noise, not the cooling. The stock AMD coolers for 4300-8350 are possibly the loudest 1st party coolers ever made
The water-cooler I got is the Corsair H45 one since I just wanted the cheapest one, unfortunately my case is from the time before water-cooling was mainstream so had to mount the radiator on the side which doesn't work perfectly since there's a round hole for fans rather than square so radiator's corners are unusable...
8Stock AMD coolers are far from the best, though the Wraith cooler on the higher end ones is decent. Noctua is the king of air coolers, their fans are surprisingly quiet. Actually they outperform many AIO liquid coolers in both cost, noise and thermals. Specifically the large 150mm one, which is admittedly too big for some cases making liquid cooling a better option for those.
@The Real Jdbye AMD coolers are the best STOCK coolers when it comes to cooling the PC, they've been the best for over 10 years now. Intel stock coolers may be more quiet, but at full load you can hit even 80-90°C which is terrible for the processor's longevity. Also, MIDI case for me with modular PSU (so less room since cables are thicker), so barely can fit 120mm aircooler, can't fit 140+mm.
i gotta say, the steam deck isn't a bad deal, even if you get a used one, you have options to get it serviced and the parts are also available through ifixit